Learning & Reference

Comprehensive guide to living in Berlin. Bureaucracy, housing, and practical advice.

DevOps and Python tutorials. Practical guides for modern development.

Amit Patel's interactive tutorials on pathfinding, map generation, and game algorithms.

SQL, SQLite, and database internals. Interactive tutorials and deep dives.

Ethan Mollick on AI in education and work. Practical takes from a Wharton professor.

Directory of global textile traditions. Artisan techniques documented.

Modern embroidery patterns and tutorials. Making embroidery cool again.

Video craft classes. Quilting, sewing, knitting, and baking.

Craft tutorials across disciplines. Knitting, sewing, paper, and more.

Pottery tutorials and tips. From beginner to advanced techniques.

Pottery and ceramics community. Techniques, glazes, and firing.

Modern sewing patterns. Ethical fashion you make yourself.

Sewing patterns and tutorials. Garment construction techniques.

Learn to sew clothes. Patterns and tutorials for beginners.

Free knitting and sewing patterns. Beautiful projects with clear instructions.

Documentation for open source machines. Build your own civilization starter kit.

Swiss foundation's comprehensive guide. WCAG implementation explained.

Heydon Pickering on accessible UI patterns. Deep dives into components.

Amateur astronomy magazine. News, observing guides, and equipment reviews.

ESRI's guide to effective data visualization on maps.

Free introduction to geo. Learn mapping concepts simply explained.

Global permaculture community. Design principles for sustainable living.

Wiki for appropriate technology and sustainability. DIY solutions for the world.

Global Investigative Journalism Network. Resources and training for journalists.

History of food and cooking. When foods were invented and how.

American home cooking with tested recipes. ATK's regional focus.

Korean cooking by the YouTube grandmother of Korean food.

Chinese recipes from a family kitchen. Authentic and accessible.

Authentic Japanese home cooking. Nami teaches traditional recipes.

Thoroughly tested baking recipes. Tips from professional bakers.

Tested recipes with ratings and comments. Sam Sifton curates.

Encyclopedia of writing systems and languages. Scripts, alphabets, and constructed languages.

Visual vocabulary and grammar. Audio for dozens of languages.

Word origins and history. Trace English words to their roots.

Collaborative dictionary with etymology. Covers every language.

Audio and video lessons for many languages. Structured curriculum with native speakers.

Multilingual dictionary portal. Keyboards, translators, and resources for hundreds of languages.

Find language tutors worldwide. Affordable one-on-one lessons.

Dynamic mathematics software. Geometry, algebra, calculus visualization.

Interactive math textbook. Explorations of geometry, algebra, and more.

Math explained simply. Algebra, geometry, data analysis for all ages.

Digital security tools and tactics for activists and journalists.

Community-driven privacy and security recommendations. Successor to PrivacyTools.

3D printing tutorials and material guides. Filament comparisons and technique deep dives.

Visual guide to 3D print problems. Identify issues and fixes from pictures.

3D printing magazine. Reviews, guides, and industry news.

Self-replicating 3D printer project. The origin of desktop 3D printing.

Advanced 3D print tuning. Pressure advance, input shaping, and quality optimization.

3D printer calibration guide. Step-by-step tuning for perfect prints.

Community 3D printing knowledge base. Printer comparisons, troubleshooting, and beginner guides.

BosnianBill's resources. Video tutorials and lock reviews.

Lockpicking guides and tutorials. Beginner-friendly techniques and tool guides.

Encyclopedia of locks and lockpicking. Mechanism explanations and history.

Wiki documenting zine culture. History, zinesters, and distros.

W3C web standard for mentions. Cross-site comments without centralized platforms.

Resources for building a smaller web. Minimal sites, local-first software.

Getting started with Gemini. Clients, servers, and hosting guides.

Official Gemini documentation. The lightweight internet protocol specification.

Collaborative guide to language construction. Theory, tutorials, and examples.

Constructed languages wiki. Documentation of conlangs and conworlds.

Mark Rosenfelder's language construction resources. The Language Construction Kit and Almea.

Docker and home automation guides. Traefik, Authelia, and self-hosting tutorials.

Home networking tutorials. OPNsense, VLANs, and network security.

Homelab tutorials and documentation. Kubernetes, Proxmox, and infrastructure.

Alex Kretzschmar's media server guide. Complete homelab setup documentation.

Server and workstation hardware reviews. Enterprise gear for homelabs.

Field recording techniques and gear. Tutorials and microphone comparisons.

LSDJ tutorials and resources. Learn Game Boy music production.

Turntable database and forums. Manuals, reviews, and setup guides.

DIY synthesizer mailing list and wiki. Build your own modules and instruments.

Synth news and educational content. Module guides and artist features.

Chris Meyer's modular synth courses. Structured learning for Eurorack.

In-depth retro game coverage. Series retrospectives and obscure game deep dives.

Retro gaming guides. Hidden gems, collecting advice, and system histories.

Unused and cut video game content. Debug modes, regional differences, and hidden secrets.

Emulator recommendations and setup guides. Best emulators for every system.

Comprehensive NetHack reference. Spoilers, strategies, and game mechanics.

Community wiki for Brogue. Strategy guides, item details, and dungeon mechanics.

Roguelike development wiki. Game design, programming tutorials, and genre history.

Speedrunning resources and guides. Community wiki for various games.

Tea education and certification. Industry knowledge and professional development.

Tea guides and reviews. Brewing techniques and variety explanations.

Chinese tea education. Gongfu brewing, tea types, and selection guides.

Pu-erh and Chinese tea resource. Reviews, vendor lists, and educational articles.

Comprehensive tea guide. Types, brewing, vendors, and beginner recommendations.

Tested cocktail recipes with technique explanations. Science-driven drink making.

Cocktail recipes and spirits guides. Classic and modern drinks with video tutorials.

Nick Fisher's cocktail science. Recreating movie drinks and exploring techniques.

Community cocktail knowledge base. Beginner guides, essential bottles, and technique FAQ.

Cocktail recipe database. Thousands of drinks with ratings, variations, and technique guides.

Fermentation and baking recipes. Yogurt, tempeh, sourdough with controlled proofing.

Sharon Flynn's fermentation guides. Kimchi, miso, tempeh, and vegetable ferments.

Comprehensive kombucha resource. Brewing guides, troubleshooting, and SCOBY care.

Fermentation tutorials and guides. Kefir, kombucha, yogurt, and vegetable ferments.

Maurizio Leo's baking guides. Detailed sourdough recipes with baker's percentages.

Vanessa Kimbell's sourdough resource. Science, recipes, and the sourdough library project.

Coffee industry news and education. Origin stories, processing, and brewing guides.

Professional coffee education. Brewing science, espresso theory, and free courses.

Professional backpacker's guides. Gear, skills, and route planning for serious adventures.

Mountain encyclopedia and climbing routes. Peak info, trip reports, and photos.

Long-distance trail planning. PCT, AT, CDT data, town guides, and resupply info.

Educational cave photography and geology. Speleothem formations explained with images.

UK and European mushroom guide. Species profiles with habitat and identification notes.

Foraging guides organized by season. Plant profiles and preservation techniques.

Green Deane's wild plant foraging resource. Plant identification and edibility guides.

Alan Bergo on wild food cooking. Recipes and techniques for foraged ingredients.

Michael Kuo's mushroom identification resource. Detailed species pages with microscopy and keys.

National Audubon Society's species database. Range maps, photos, and conservation status.

David Sibley's bird identification resources. The gold standard in North American field guides.

Birding news and tips. Species profiles, gear reviews, and hotspot guides.

Cornell Lab's bird guide. Species accounts, sounds, and identification tips for North American birds.

Manohar Vanga on generative art algorithms. Deep dives into flow fields, noise, and organic patterns.

Plotter art tutorials and experiments. Code, techniques, and beautiful output.

Paul Sellers' video courses. Complete project builds from start to finish using hand tools.

Master woodworker's free tutorials. Hand tool techniques with decades of teaching experience.

Shannon Rogers on traditional hand tool work. Detailed project builds and technique videos.

Encyclopedic wood species reference. Properties, workability, and identification for hundreds of species.

Premium woodworking content. Expert techniques, furniture plans, and shop setup guides.

Woodworking magazine online. Project plans, techniques, tool reviews, and video tutorials.

Knifemaker's tutorials and guides. Step-by-step process documentation.

Jon Broida on Japanese knives. Sharpening, steel types, and kitchen knife knowledge.

British saddler and leather educator. Courses, videos, and traditional techniques.

Romanian leatherworker's tutorials and patterns. Detailed guides for bags and accessories.

Free downloadable leathercraft patterns. Wallets, bags, and accessories with templates.

Community leathercraft tutorials. Step-by-step projects from wallets to armor.

Watchmaking tutorials and guides. Learn to service and repair mechanical watches.

TAG Heuer and vintage chronograph specialists. Deep historical research and references.

Watch encyclopedias and guides. Movement databases and brand histories.

Watch journalism and collecting. In-depth articles on horology, reviews, and industry news.

Comprehensive fountain pen ink reviews. Swatches, water tests, and comparisons across papers.

In-depth guides to Japanese stationery. Pen comparisons, ink swatches, and paper reviews.

Mechanical keyboard guides and reviews. Switch comparisons, build tutorials, and buying guides.

Documentation for QMK, the open source keyboard firmware. Features, customization, and flashing guides.

Typing practice that adapts to your weaknesses. Algorithm generates lessons based on your problem keys.

Mechanical keyboard wiki and forums. Deep encyclopedia of switches, vintage boards, and modifications.

Comprehensive guide to mechanical keyboards. Switches, layouts, keycaps, and build guides for beginners.

Encyclopedic amateur radio reference. Antennas, propagation, modes, and technical fundamentals.

Free amateur radio exam study resource. Practice tests and flashcards for all US license classes.

Software defined radio tutorials and news. Turn cheap TV tuners into powerful radio receivers.

Database of radio signals. Identify unknown transmissions by their sound and waterfall pattern.

Ham radio encyclopedic resource. Equipment reviews, articles, swap shop, and active forums.

American Radio Relay League. The national association for amateur radio in the US. News, licensing info, and technical resources.

Inigo Quilez's demogroup and resource site. Mathematical art, raymarching tutorials, and Shadertoy's creator.

Wiki about sustainable computing. Principles for designing systems that last and minimize environmental impact.

Tim Urban's long-form illustrated essays. AI, procrastination, Fermi paradox, and more.

The legendary hacker ezine since 1985. Technical articles on security, exploitation, and hacker culture. Issue 72 in 2025.

Interactive explorations of complex systems. Emergence, chaos, networks - play with the math.

Simplified man pages. Community-maintained examples for command-line tools that actually help.

Find the package that contains a command. Covers major Linux distributions and macOS.

World's leading resource for climate solutions. 100 solutions to reverse global warming.

Stunning interactive explainers on mechanical watches, GPS, cameras, and more. Engineering education at its finest.

ELF research group and zine. Deep technical content on binary hacking, virus writing, and Linux internals.

Proof of Concept or GTFO. Hacker journal with deeply technical essays on reverse engineering and file formats. Often a valid PDF, ZIP, and bootable OS simultaneously.

Archive of public exploits and vulnerable software. Essential resource for security researchers and penetration testers.

Massive wiki of hacking techniques for CTFs and pentesting. Privilege escalation, web attacks, and more.

Curated typography inspiration. See what fonts websites are using and get recommendations.

Matthew Butterick's guide to typography. Free online book covering everything from font choice to page layout.

Repository of command-line snippets. User-submitted one-liners for common and obscure tasks.

Free education for anyone, anywhere. Math, science, computing, and more with personalized learning.

Interactive courses in math, science, and CS. Learn by solving problems, not watching videos.

Grant Sanderson's math animations. Beautiful visualizations that build genuine understanding.

Math and programming concepts explained intuitively. Focus on understanding over memorization.

Visualize algorithms and data structures. Step through sorting, trees, graphs, and more.

Translation search engine. See how words and phrases are translated in real documents.

Radon Rosborough's blog on math and tech. Documented Replit's legal threats against open source projects.

Collection of prompt examples for ChatGPT. Creative, useful, and fun prompts to try.

Path to a free self-taught CS education. 200K+ stars. Complete curriculum using free online courses.

Freely available programming books in many languages. 350K+ stars. The ultimate free learning resource.

Curated list of project-based tutorials. Learn by building real projects in various languages.

Master programming by recreating technologies from scratch. Build your own Git, Docker, database, etc.

Digital photography reviews. In-depth camera and lens reviews with sample images.

Resources for writers since 1920. Craft advice, markets, and publishing guidance.

Free MIT course materials. Lectures, notes, and assignments from real MIT classes.

Online courses from top universities. Free to audit, certificates available.

Free online courses from Harvard, MIT, and more. Founded by universities.

Learn to code for free. Full curriculum from HTML to machine learning.

Free full-stack web development curriculum. Project-based learning path.

Deep dive into modern web development. University of Helsinki's free course.

Curated guide to self-teaching computer science. Best resources for each topic.

MIT course on practical computing skills. Shell, Git, debugging, and more.

Free book on implementing programming languages. Build two interpreters from scratch.

Free book on JavaScript and programming. A modern introduction with exercises.

Hands-on introduction to Go. Annotated example programs.

Gary Bernhardt's screencasts on software. Advanced topics explained well.

Julia Evans' illustrated zines on technical topics. Git, SQL, Linux, and more.

Interactive regex tutorial. Learn regular expressions step by step.

Interactive SQL tutorial. Practice queries on real databases.

Comprehensive PostgreSQL guide. From basics to advanced topics.

SQL indexing and tuning guide. Make your database queries fast.

How real sites handle scale. Architecture case studies from tech companies.

Ableton's interactive music course. Learn beats, melody, and production basics in your browser.

Interactive introduction to synthesizers. Play with oscillators, filters, and envelopes in the browser.

See translations in context. Millions of examples from real texts in multiple languages.

Pronunciation dictionary. Native speakers pronounce words in their language.

Science-based cooking. Kenji Lopez-Alt and team explain why techniques work, not just how.

NYT's approach to intuitive cooking. Teaches techniques over rigid measurements.

Delicious recipes that won't break the bank. Every recipe includes cost breakdown.

Simple recipes in plain text. No popups, no life stories, just ingredients and instructions.

Practice typing by retyping entire novels. Learn to type faster while reading classic literature.

Explore the relative sizes of emoji objects. Scroll through a visual comparison from atoms to galaxies.

Curated list of falsehoods programmers believe. Names, time, addresses, and more gotchas.

Meditation and mindfulness app. Guided sessions for stress, sleep, and focus.

Free language learning. Gamified lessons in 40+ languages with millions of users.

Learn vocabulary in context. Fill-in-the-blank exercises with real sentences.

Collection of sentences and translations. User-contributed parallel corpus for language learning.

Free audio courses teaching thinking methods for languages. Spanish, French, German, and more.

Immersion-based language learning roadmap. Learn languages the way children do.

Math training for bright students. From contest math to university preparation.

Interactive mathematics miscellany. Hundreds of puzzles, proofs, and explorations.

Challenging mathematical/programming problems. 800+ problems requiring code and math.

Community-driven guide to web accessibility. Resources, checklist, and patterns for inclusive design.

Web accessibility resources. Articles, tools, and training for making the web work for everyone.

Knowledge base that works on local Markdown files. Powerful linking, graph view, and extensible plugins.

Interactive explainer on how data collection chills free expression. How surveillance changes behavior.

Authoritative, peer-reviewed philosophy reference. The definitive resource for philosophy.

Peer-reviewed academic resource on philosophy. Accessible yet rigorous articles.

Stoic philosophy for everyday life. Practical wisdom from ancient philosophers.

Recipes, menus, and cooking guidance. Well-tested recipes from multiple sources.

Recipes from the New York Times. Expertly developed and thoroughly tested recipes.

Daily food magazine. Recipes, tips, and inspiration for home cooks.

Investment advice inspired by John Bogle. Forum for passive, low-cost investing.

Financial independence through badassity. Early retirement and frugal living blog.

Financial education and market data. Learn investing concepts and track markets.

Design patterns and refactoring techniques. Illustrated examples in multiple languages.

Design patterns, antipatterns, and refactoring. Software design knowledge base.

Methodology for building modern web apps. The definitive guide to SaaS development.

Version numbering specification. The standard for software versioning.

Specification for commit messages. Standardize your git history.

How to write a good changelog. Don't let your friends dump git logs.

Simple guide to open source licenses. Pick the right license for your project.

Guided tour of Git fundamentals. Hands-on learning from basics to advanced.

Git problems and how to fix them. For when you mess up.

The official Git book. Free, comprehensive, and authoritative.

Linux and Unix tutorials and tips. Practical sysadmin knowledge.

Learn Linux step by step. From command line basics to system administration.

Learn security through challenges. SSH-based hacking games.

Learn cryptography by breaking it. Programming challenges teaching crypto.

Cybersecurity education platform. CTF-style learning from ASU.

Learn cybersecurity through hands-on exercises. Guided hacking rooms.

Free web security training. Learn to find and exploit vulnerabilities.

Build a computer from scratch. Video series on building a CPU, GPU, and networking from basic components.

Free electrical engineering education. Textbooks, worksheets, calculators, and community forums.

Interactive tutorial transforming plain HTML into a beautiful page. Learn CSS fundamentals step by step.

Collection of visual design rules you can safely follow. Practical tips for making things look better.

Free fitness resource. Workouts, programs, and challenges with no ads or fees.

Unbiased nutrition and supplement information. Evidence-based health research.

Simple strength training program. 5x5 workout routine for beginners.

Physics tutorials and interactives. Clear explanations of physics concepts.

Interactive science simulations. Physics, chemistry, biology, and math.

Math and physics applets. Interactive simulations for learning.

Free MIT physics courses. From mechanics to quantum field theory.

Richard Feynman's legendary physics lectures. Free online edition.

Encyclopedic physics reference. Concept maps connecting physics topics.

Chemistry tutorials for students. Clear explanations of chemistry concepts.

Organic chemistry resources. Reactions, mechanisms, and synthesis.

Free access to books and papers. Shadow library for research and textbooks.

Guitar, bass, and drum tabs with playback. Learn songs with interactive notation.

Understand music theory through popular songs. Learn how hit songs are constructed.

Free cultural and educational media. Courses, books, films, and more.

Gardening guides and tips. From vegetables to flowers to lawn care.

Planting calendar and gardening guides. Traditional wisdom for growers.

Comprehensive mathematics encyclopedia. Definitions, theorems, and explanations for every math concept.

Beautiful, powerful graphing calculator in the browser. Free and used in schools worldwide.

Online Encyclopedia of Integer Sequences. Look up any sequence of numbers and find its mathematical meaning.

Step-by-step instructions for making anything. Crafts, electronics, cooking, and everything in between.

Free repair guides for everything. Teardowns, parts, and tools to fix your own devices.

Quick reference guides for programming languages. Learn the syntax of a new language in one page.

Community-driven roadmaps for developers. Visual guides for learning frontend, backend, DevOps, and more.

Friendly, illustrated explanations of computer science concepts. Makes complex topics accessible through zines and blog posts.

Paste a command line and get a breakdown of every argument. Essential for understanding complex shell commands.

Browser support tables for web technologies. Check if that CSS feature works in your target browsers.

The most deployed database in the world. Excellent documentation and fascinating technical articles about its design.

API documentation browser with offline support. Search across hundreds of frameworks in one place.

Open source collection of algorithms implemented in multiple programming languages. Great for learning.

Interactive explorable explanations of complex topics. Game theory, anxiety, social networks visualized.

Movement to own your own content and identity online. Resources for building your personal website.

Machine learning research journal with interactive visualizations. Making ML concepts understandable.

EFF's guide to protecting yourself from surveillance. Practical security for activists and everyone.

Community-driven resource for privacy and security tools. Transparent recommendations, no affiliate links.