Every yellow flash is a re-render. Interact with the demo, spot what shouldn't be flashing, then open the solution tab to see the fix.
Exercise 1 of 1
Side effects in the render body fire multiple times — Strict Mode makes this visible. Move them to useEffect to guarantee exactly-once execution.
Component
renders: 1External queue (should have 0 entries)
Click the button to see entries appear…
Each click should add exactly 1 entry.