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In plain words
The app knocks. You decide. Grant only what the lesson needs. Clipboard is enough on day one. Camera and location can sleep until a project asks.
This is a model, not your real settings. On the phone the same idea appears as Allow or Deny.
The helper app from F-Droid. The termux-api package inside Termux. One without the other is a doorbell with no wiring.
If battery or clipboard commands fail: the app is missing, it came from a different store than Termux, or you never opened it and granted permission.
The next room is practical: versions, storage, heat, and why a later build is hungry.
Version, storage, heat. The phone is the computer.