React Mastery – Interactive ReactJS learning with guided challenges

Summary: React Mastery provides 54 progressive ReactJS challenges that teach fundamentals through building full apps with line-by-line feedback and explanations. It requires no setup and tracks challenge completion to support learning.

What it does

It offers interactive coding challenges with built-in pedagogy, including line-by-line explanations and a "Mental Model" tab that clarifies the why and how behind React concepts.

Who it's for

Developers seeking hands-on practice with ReactJS fundamentals through guided, incremental challenges.

Why it matters

It helps learners identify and correct mistakes in real time, reinforcing understanding without setup overhead.