Pick a directory you want to analyze and run
ncdu . Yes, with the dot. It should look like that:
If you don’t have
ncdu installed, install it.
If you can’t, you can use the simpler standard utility
du like that:
du -hs *
-h makes the output humanly readable,
du that you want to see the total size of items without listing every directory in the file system tree, and
* says that you want
du to operate on all of the items in the current directory.
The output will be something like:
Repeat if necessary for sub-directories.