You can use the git's stash feature to temporarily shelve (or stash) changes you've made to your working copy so that you can work on something else, and then come back and re-apply the stashed changes later on. _{-- adapted from this}

Follow this article from SourceTree creators. Note the GUI shown in the article is slightly outdated but you should be able to map it to the current GUI.

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Follow this article from Atlassian.

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