Hope this will stay relevant for longer than just 2021. This guide will focus mostly on things you shouldn't overlook and will harshly prioritise assuming that you're running on recent hardware. EFI and all that.
Always refer to the official guide in case of doubt.
One important thing first: the environment you will encounter on the live image is very different
from what you'll end up installing, some things are significantly easier there: e.g. wifi tools come
pre-installed, the default shell is a pimped zsh with nice completions, and so on. We'll keep this