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Short Java exercises grouped by language technique

A guided practical tour of Git fundamentals

A Clojure learning book with further programming resources

Operating-system concepts supported by projects and exercises

Practice-led coding paths for data work

Developer courses arranged into focused learning paths

Programming study alongside practice and contests

Coding practice grouped by technical skill

A coding problem bank with topic and difficulty choices

Programming contests with a permanent practice entry point

A contest community with a reusable programming problemset

Data and AI courses organized around career paths

Programming rounds and practice problems in one hub

A programming-problem collection with community discussion

Free introductory open courses including software engineering

Coding programs centered on algorithms and web development

Project-oriented coding courses across technical subjects

Programming explanations alongside algorithm practice

A topic-organized collection of programming tutorials

Java learning guides spanning language, frameworks and tests

Java and Spring tutorials organized by technology

Courses focused on mobile-development skills

R examples organized around statistical methods

Godot game-development courses from Heart Gamedev