Change git commit message

git commit --amend -m "New commit message"

Git amend commit message

git checkout branch_name
git commit --amend -m "Modified message"
# if previous commit is not pushed yet
git push
# or if previous comment was pushed in a previous commit:
git push --force-with-lease branch_name

Source: docs.github.com

Git commit amend without changing message

git commit --amend --no-edit

Github change last commit message

# for the most recent commit
git commit --amend -m "changed commits"
git push -f
# for n older commits
git rebase -i HEAD~n
# use r for reword to edit older commits
# removing a line means THAT COMMIT WILL BE LOST. 
git rebase --continue
# solve conflicts if exist
git push -f
# git push --force-with-lease origin <branch> is safer

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