Cheat Sheet
| Question | Core Idea | Senior Signal |
|---|---|---|
| Q151 | Rendering | React render is calculation; commit and browser paint are separate. |
| Q152 | Fiber | Fiber represents schedulable units of React work. |
| Q153 | Keys | Keys control identity among siblings and protect local state. |
| Q154-Q155 | State and effects | State is a render snapshot; effects synchronize external systems with cleanup. |