We commit our changes to our local source control repository. It is a good idea to commit often. If we have a lot of commits, we can squash them into a single commit once we have completed all our work (if we wish to). Saving our work regularly helps to keep a history of what we have achieved recently. It is a bit like playing a tricky computer game and saving our progress regularly. In case we take a wrong turn, we can roll back as far as we would like to.
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