Even basic things in distros are quite different, for example the frontend for settings, so tech support threads will show how to do it in the backend. Oh well, but then there’s someone who suggests

sudo nano /etc/default/grub

If you’re a noob, run this and get a “nano: command not found” error, you’ll google it and learn to resolve it using apt. But Manjaro’s package manager is pacman but you don’t know, so you install apt using a weird guide without knowing what it even is.

My first install ended in a dependency hell because of this.

Well no one in there right mind should use Manjaro so that was mistake no. 1