React — Intermediate

Components, JSX, props, state basics, and event handling. Most items are a choice; the others ask for a prop name or whether a statement is true.

One screen where JavaScript values, listeners, and arrays meet React: a controlled field, effect cleanup, row identity, and a render error while mapping.

One typed React screen on the Next.js App Router: server and client boundaries, props that cross them, edge checks before the page, and cache revalidation for that view.

Advanced full-path scenarios connecting React UI, Next.js App Router boundaries, and Node.js APIs across authentication, caching, streaming, uploads, and failure handling.

Concurrent features, transitions, suspense data, performance traps, and composition at scale. Most items are a choice; the others are true-or-false statements or the line that breaks a memoized child.

Joint scenarios for a NestJS API and a React client: BFF boundaries, cookie sessions and CSRF, CORS with credentials, DTO validation, and structured errors for forms and global notices.