If your truely going the endevour route, here some tips on recoving from a broken state:
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The archwiki is your friend, read the relevant pages before asking on forums
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Install arch manually (no archinstall) and thoroughly read the wiki to understand how your system is put together. Then install endevour, just from doing a manual arch install you should have the knowlage to fix like 90% of issues
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Learn the basics of systemD, will also help you on 99% of mainstream distros
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Keep your /home directory on a seperate partition, useful for doing a system rescue and for distrohopping


Defaults are good for me but I like mounting my secondary drive to ~/Storage with subfolders media, projects, games