YouTube

Do this, in order

1. 1

   Decide: Kids app or supervised account?

   Under 9 → YouTube Kids (a whole separate app, totally curated). 9–13 → Supervised account. 13+ → Restricted Mode is the best you'll get.
2. 2

   For under 9 — install YouTube Kids

   App Store / Play Store. Set the age band on first launch. Pick the curated channels you want.
3. 3

   For 9–13 — open Family Link

   Tap your kid → Controls → YouTube → Manage settings → choose Explore or Explore More (filtered).
4. 4

   For 13+ — on the kid's YouTube app

   Profile → Settings → General → Restricted Mode ON.
5. 5

   Also turn off Autoplay

   Settings → Autoplay → off. Kills the "just one more video" loop.
6. 6

   Pause Watch History weekly

   Settings → Manage all history → Clear all watch history. Resets the algorithm.
7. 7

   Bonus: install SafeGuard

   Blocks Shorts and the homepage feed in Chrome — kid can still watch direct video links.