hint: Updates were rejected because the tip of your current branch is behind hint: its remote counterpart. Integrate the remote changes (e.g. hint: 'git pull ...') before pushing again. code example
Example 1: git updates were rejected because the tip of your current branch is behind
git push -f origin master
Example 2: Updates were rejected because a pushed branch tip is behind its remote
// if this don't work
git pull origin FixForBug
git push origin FixForBug
// then, do this:
git push -f origin FixForBug
Example 3: updates were rejected because the tip of your current branch is behind
git push -f origin master