git pull

Hi,
i'm learning about git and soon have a question.
My repo is in /dev/sda6 and my home is in /dev/sda4, as are both in
local i thought that when i committ, i'll found the files on repo
changed, it was not so! I learn i have to use git pull, but i didn't
understand why.
I made some tries, put my repo in /home/user/myrepo cloned in
/home/user/myclones changed files and committed and the changes was in
the repo without any need of pulling, and i have permission to write
to /dev/sda6, so why have i to pull changes?

Thanks.


Matteo