# Lesson 4 complete: fetch + respondWith

Learner finished lesson 4 (fetch interception, respondWith, clone rule, navigate vs subresource). Floor for next lessons: controlled clients get fetch events; respondWith owns the Response; omit it → normal network path; clone when return + put. Next ZPD: **deal-breakers & debugging** — 60-second design-review scan + DevTools habits. Strategies remain owned by Cache API track.