Mainly Sourcetree is a GUI for command-line git. You should be familiar with the concepts of git (or mercurial) when using sourcetree ...
If your sourcecode is not git controlled yet - you should at least create a local sourcecoderepository and store your code within it .... (Keywords: "git init", "git add", "git commit")
If your Sourcecode is already git controlled, you have to add your repository to sourcetree (Toolbar "Clone/New" -> Tab "Add working copy") and you can work with your sourcecode within Sourcetree afterwards ...
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