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git checkout -b presentation-dev-branch

#
# Now develop your presentation content in this branch,
# committing as often as you want
# Then when you are finished, do the following:
#

git checkout master
git merge --squash presentation-dev-branch

#
# Now bundle all of your commit changes from your branch
# into a single commit on master ready for one final push
#

git add -A
git commit -m "Completed GitPitch presentation."
git push

詳しくは公式