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In Projects, you can keep track of your progress as you go throught the tasks. Check each item as you complete it!
What if you decide to change the ghost's line in the working directory, but then decide you wanted to discard that change?
You could rewrite the line how it was originally, but what if you forgot the exact wording? The command
git checkout HEAD filename
will restore the file in your working directory to look exactly as it did when you last made a commit.