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TortoiseGit is easy to use, because it is integrated with Windows shell as well as lots of development utilities, but I won't cover about that at the moment.
STEP 1. Install git
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on Windows 10
For git, you need to download a core component at https://git-scm.com/downloads
Once download is done, you need to install it on your PC.
STEP 2. Install TortoiseGit client
Download TortoiseGit at https://tortoisegit.org/download/
STEP 3. Create a repository on your PC
In order to manage the source code efficiently, you need to have your own location on your PC, so you can add new features, modify the legacy codes without any dependency in external sources.
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If you have your own private server, having no dependency with others, which can run full features, it will be the best development environment - some people usually use VM like QEMU.
To be updated....