Next step
One short meaning for a word that keeps repeating.
The failures that actually happen
Read the symptom. Then the fix.
I installed Termux from Play Store and nothing works
Uninstall it. Install Termux and Termux:API from F-Droid only. Same store for both.
The command says command not found
The package is not installed, or you typed the name wrong. Check spelling. Then pkg install that tool.
Nano will not close
Ctrl+O, Enter, Ctrl+X. Ctrl means Control. Termux often shows an extra CTRL row.
I feel stupid
Everyone starts by breaking small files. Confusion means you reached the edge of what you know. That is the only place learning happens.
I want to build a huge app first
Make the button work. Huge apps are many tiny apps glued together.
Grok wrote the whole program for me
That is a demo, not practice. Delete it. Rewrite it from memory. Ask for hints, not the full file.
The phone gets hot during a build
Normal. Let it finish. Close extra apps. Do not expect laptop speed.