You could use hub, created by GitHub as a wrapper around the Git CLI to make it more natural to work with GitHub OSS projects. hub.github.com/
Alternatively, I find Git GUIs to be especially good at working with remotes and managing PRs, especially GitKraken. There's a lot I still do with my local Git CLI, but having a GUI for the less-frequently-used stuff is quite an invaluable tool.
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