But I dont know what they are, for example /etc, /usr /,
there are lots of directories inside and I dont know exactly what they are.
I have given an example on windows, if you read it again I think you will understand what I mean.
For example I was using C drive on windows, for operating system and programs and games.But Drive D was for my secured datas, pictures, musics, documents etc. I want to do it on linux.
ex. for system: 3gb (but what is it name on linux)
for documents: 16 gb (but what is it name on linux) ex, is it /usr ????