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Me personally, I've found the EndeavourOS community to be very friendly and helpfull, the forums on the official site, as well as this Subreddit are great places to get help, when you're stuck, but also try the archwiki first - https://wiki.archlinux.org/ as Endeavour is Arch based this can be an invaluable resource.
Not entirely sure what you're asking here. You should not need to deal with git commands yourself if you use an AUR helper (like yay) to install something. The git clone command is for cloning the source code of a git repository (e.g. here is the mullvad app repository https://github.com/mullvad/mullvadvpn-app).