set branch to las commit code example

Example 1: set head of branch at specific commit

# You can make master point at a specific commit this way
git checkout master
git reset --hard <commit-hash>

# git reset --hard command will throw away any uncommitted changes 
# (i.e. those just in your working tree or the index).

Example 2: how to revert a git revert

git revert <commitHashOfTheRevert> # locate the hash the revert was done 
                             #this will invert the changes made in that commit
                             #and preserve the git history