This is the suite's regression gate. Answer every question, then run the suite. Wrong answers show an explanation — read it, then re-run. In this course, like on a real team, you don't merge on a red build.
01.A successful POST that created a resource typically returns…
201 Created. Plain 200 is generic success; 204 is success-with-no-body (common on DELETE).
02.Status 4xx vs 5xx — the rule of thumb:
400/401/404 say “your request was wrong”; 500s say “the server fell over.” It's your first triage signal.