I've found something interesting in one of the posts.

I quote
'
The command is 'Drop Tablespace '. (then go and delete the corresponding datafiles at the OS level, because Oracle does not do this for you.)
'
Here is my question:
If you drop tables it realeases storage. My assumption was:
although OS doesn't delete the datafile, after dropping all tables belonging to that datafile if you look at the datafile through OS datafile's size becomes 0 or something close to that, right?
thank you.