Based on an 8-week React 80/20 roadmap

React 80/20 Interview Prep

React 19.3 Compiler 1.0 Next.js 16

Two packages, kept separate. 80/20 Core follows an 8-week React learning roadmap built on the 80/20 rule: the 17 skills that cover most day-to-day React work, in the order interviewers usually probe them, plus a "skip list" of legacy topics you only need to recognise. Beyond 80/20 is an add-on with practice for roadmap skills that had no coding or technical questions, and common interview topics the roadmap leaves out. Open a question, say the Say this first line out loud, then check the detail.

BasicIntermediateAdvanced React 19+ new since React 19 Checkpoint a skill check from the roadmap's weekly goals Legacy skip-list topics to recognise, not use