SQLBolt provides a series of interactive lessons and exercises designed to help users learn SQL in the browser. Lessons cover SELECT queries, constraints, filtering and sorting, JOINs, expressions, aggregates, order of execution, and inserting, updating and deleting rows, as well as creating, altering and dropping tables. Additional topics include subqueries and unions.
Genepy is a website offering interactive Python exercises, including basics, functions, comparisons and word counting. It provides immediate feedback from its corrector and supports individual and team leaderboards. A command line interface is available for users who prefer not to use the web editor.
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Hacksplaining offers free interactive secure coding lessons in which users exploit real attacks in the browser and then learn the fix. The lessons cover the OWASP Top 10 and GenAI-era threats such as prompt injection, and are free for personal use. Team training is also offered.
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Genepy is a website offering interactive Python exercises, including basics, functions, comparisons and word counting. It provides immediate feedback from its corrector and supports individual and team leaderboards. A command line interface is available for users who prefer not to use the web editor.
CodeAnalogies is a series of tutorials that explain CSS and JavaScript topics with visual guides, analogies and diagrams. Its lessons cover basic web development concepts, and tutorials are described as including a high-level analogy to a real-world concept, diagrams, and examples using actual code.
Git Commands is a reference page listing main Git commands with short explanations, covering starting a repository, checking status, undoing changes, managing branches and orphan branches. The page is available in English and Portuguese.
CSDIY is an English-language self-learning guide to computer science, described as a memento of the author's three years of self-learning at university. It contains a user guide, a reference CS learning plan, a productivity toolkit, book recommendations, and a list of high quality CS courses.
Hacksplaining offers free interactive secure coding lessons in which users exploit real attacks in the browser and then learn the fix. The lessons cover the OWASP Top 10 and GenAI-era threats such as prompt injection, and are free for personal use. Team training is also offered.
CSS Battle is a multiplayer CSS game in which players recreate target images using the shortest possible CSS code. It offers daily challenges, live battles, versus rooms and leaderboards, and states that the shorter the CSS, the higher the score. The site also offers material for learning CSS.
