Education
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Hacker Laws
A browsable collection of laws, theories and principles such as Hofstadter's Law, Conway's Law and the Peter Principle,…
Hacker News Books
Browse the books most recommended in 40,000 Hacker News comments, ranked by mentions and sorted by category, with the co…
Hacker101
A free class on web security from HackerOne, with video lessons and capture-the-flag challenges for programmers curious…
Hacking Chinese
A guide to learning Mandarin with articles on listening, speaking, reading, writing, and characters, tackling what most…
Hackster.io
A large maker community publishing thousands of open hardware projects with full build logs, code, and parts lists for h…
HackTricks
A cybersecurity knowledge base of practical penetration testing and red team techniques, covering web, cloud, binary exp…
Hadrosaurus.com
The story of how the first dinosaur skeleton ever found was dug up in Haddonfield, New Jersey in 1858, with historical p…
Half Cat Rocketry
A guide that lowers the barrier to entry for amateur liquid rocket engines, with write-ups on how hobbyists design, buil…
Halt and Catch Fire Syllabus
A self-guided curriculum built around the TV series Halt and Catch Fire, pairing each episode with readings, videos and…
Hands-On Data Visualization
A free open-access book that teaches how to tell stories with charts and interactive maps using easy web tools, from spr…
Handspeak
An American Sign Language dictionary and learning resource with thousands of signed word videos and notes on Deaf cultur…
Hans Hofmann
The official Hans Hofmann site, with an image gallery of his vivid abstract paintings, a decade-by-decade biographical c…
HardBreak
An open-source wiki that teaches hardware hacking step by step, from reconnaissance and interface interaction to firmwar…
Hardcore Gaming 101
An encyclopedic site of deeply researched articles on obscure, classic, and international video games, spanning decades…
Hark! A Vagrant
The archive of Kate Beaton's beloved webcomic, full of hilarious strips about historical figures, classic literature, Na…
Harvard Health Blog
The blog of Harvard Health Publishing, with expert articles on healthier living, nutrition, and common health conditions…
HathiTrust Digital Library
A vast digital library of scanned historical books and documents from research libraries, freely readable for public-dom…
HathiTrust Featured Collections
Featured collections from the HathiTrust Digital Library, curated sets of digitised books on themes from cookbooks to tr…
Hatnote
A collection of perspectives on wiki life, home to projects like Listen to Wikipedia, Weeklypedia and a recent changes m…
Hawaii Highways
An unofficial, non-commercial guide to Hawaii's highways for road scholars, with route-by-route listings, history and ph…
HBS Working Knowledge
Harvard Business School's Working Knowledge shares faculty research on management, strategy, and markets in accessible p…
HEAD
A simple guide to the HTML head element, laying out the meta tags, links and scripts worth knowing for SEO, social shari…
Hear the Boat Sing
A blog on the rich history of rowing as a sport, a culture and a way of life, with stories of crews, boats and the peopl…
Heart to Hearth Cookery
Susan McLellan Plaisted's experimental archaeology of food, with research and write-ups recreating historical dishes and…
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