Newly listed sites

Interactive SQL lessons ordered by query concept

Free introductory open courses including software engineering

Rebuild familiar software through staged coding challenges

An annual collection of language-independent programming puzzles

Short Java exercises grouped by language technique

Small interactive coding challenges

A programming-problem collection with community discussion

Programming rounds and practice problems in one hub

Contest problems with automatic solution judging

A programming problem archive with difficulty guidance

Mathematical problems that reward programming solutions

Algorithm exercises grouped into a structured problem set

Python and TypeScript practice through coding missions

Data and AI courses organized around career paths

A contest community with a reusable programming problemset

Programming contests with a permanent practice entry point

A coding problem bank with topic and difficulty choices

Coding practice grouped by technical skill

Programming study alongside practice and contests

Coding bites with starter code, tests and discussion

Focused Python challenges with detailed solution study

Python tutorials with paths, quizzes and exercises

A searchable library of coding videos and workshops

Interactive coding lessons leading into projects