Worflow to GIT for Hg migrater?

Question

git

Worked with Hg like this:
Locally did

#hg commit 
#hg push

On the server, I deployed it like this:
#hg update
And rollback to the revision you need
#hg update -r 12
What will be the workflow for git?
If there were changed files on the server, then after the update, if the update itself did not affect them, will they remain with the changes?