Quick answer

Find what fills Termux storage, clean package cache, remove build leftovers, and move outputs safely to Android Downloads.

This page separates the real No Space Left cause from noise in the terminal output.

For No Space Left, focus on files, paths, storage and backups and use the output to decide the next small fix instead of reinstalling everything.

What to check

Use the guide for No Space Left only after one short command can reproduce the problem.
For No Space Left, keywords that usually matter are: Space, Left.
If the first command for No Space Left gives a different error, follow the new clue instead of forcing this guide.

For No Space Left, replace placeholders only when they appear in the command.

df -h
du -h -d 1 ~ | sort -h
apt clean
mkdir -p /storage/emulated/0/Download/DedSec-Exports

df -h — shows storage usage so you know whether the device is full for No Space Left.
du -h -d 1 ~ | sort -h — shows storage usage so you know whether the device is full for No Space Left.
apt clean — checks the part of the files, paths, storage and backups workflow that usually causes this issue for No Space Left.
mkdir -p /storage/emulated/0/Download/DedSec-Exports — checks the part of the files, paths, storage and backups workflow that usually causes this issue for No Space Left.

Change one thing at a time while testing No Space Left.
If the No Space Left error changes, read the new clue instead of repeating the old fix.
Keep screenshots or copied terminal text for No Space Left; they make paid help faster if you need it.

Running the No Space Left command from the home folder when the project is somewhere else.
Following a desktop Linux answer that ignores Android storage paths while fixing No Space Left.
Closing Termux before copying the output that explains No Space Left.

If no space left the file path still does not make sense, send a screenshot of pwd, ls, and the error through the Store.