The Cryptopals Crypto Challenges are a collection of exercises demonstrating attacks on real-world cryptography, derived from weaknesses in real-world systems and modern cryptographic constructions. The eight sets become progressively harder, and proficiency in any programming language is required.
SQL Easy is a free interactive SQL tutorial offering 31 exercises that run against a real SQLite database in the browser. It provides hints when users are stuck and immediate feedback when a query is correct, and requires no signup. It is built by the team behind Beekeeper Studio.
A guide to self-study computer science. It recommends nine subjects in a rough order and suggests a textbook or video lecture series for each, with about 100-200 hours of study per topic. It was extensively updated in May 2020 and has volunteer translations.
CS50 is Harvard University's introduction to computer science and programming, intended for students with or without prior experience. It covers computational thinking, abstraction, algorithms and data structures, and programming in C, then Python, and later SQL, HTML, CSS and JavaScript, ending with a final project. The material is available free online through OpenCourseWare over eleven weeks.
CraftingInterpreters provides educational videos, lessons, tutorials, or self-learning resources.
Makefile Tutorial provides educational videos, lessons, tutorials, or self-learning resources.
Eylenburg's Tech Website is a personal site offering comparison tables and timelines on technology topics, including operating systems, Android-based distributions, Linux distributions, desktop environments and web browsers. It also documents digital freedom across 17 countries and the history of browser engines from 1990.
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SQL Easy is a free interactive SQL tutorial offering 31 exercises that run against a real SQLite database in the browser. It provides hints when users are stuck and immediate feedback when a query is correct, and requires no signup. It is built by the team behind Beekeeper Studio.
A guide to self-study computer science. It recommends nine subjects in a rough order and suggests a textbook or video lecture series for each, with about 100-200 hours of study per topic. It was extensively updated in May 2020 and has volunteer translations.
CS50 is Harvard University's introduction to computer science and programming, intended for students with or without prior experience. It covers computational thinking, abstraction, algorithms and data structures, and programming in C, then Python, and later SQL, HTML, CSS and JavaScript, ending with a final project. The material is available free online through OpenCourseWare over eleven weeks.
CraftingInterpreters provides educational videos, lessons, tutorials, or self-learning resources.
Makefile Tutorial provides educational videos, lessons, tutorials, or self-learning resources.
Eylenburg's Tech Website is a personal site offering comparison tables and timelines on technology topics, including operating systems, Android-based distributions, Linux distributions, desktop environments and web browsers. It also documents digital freedom across 17 countries and the history of browser engines from 1990.
