To rollback the last commit:
git reset HEAD~
It will revert your last commit. Your changes will stay locally so you are safe.
Example:
$ git status
On branch b
Changes not staged for commit:
(use "git add <file>..." to update what will be committed)
(use "git checkout -- <file>..." to discard changes in working directory)
modified: test.txt
no changes added to commit (use "git add" and/or "git commit -a")
$ git add test.txt
$ git commit -m "Some changes"
[b af8119f] Some changes
1 file changed, 2 insertions(+)
$ git status
On branch b
nothing to commit, working tree clean
$ git reset HEAD~
Unstaged changes after reset:
M test.txt
$ git status
On branch b
Changes not staged for commit:
(use "git add <file>..." to update what will be committed)
(use "git checkout -- <file>..." to discard changes in working directory)
modified: test.txt
no changes added to commit (use "git add" and/or "git commit -a")
Use git reset HEAD~2 to rollback last 2 commits, git reset HEAD~3 to rollback last 3 commits, etc.