The wiki has some information and should correspond to how Ubuntu specifically is configured. You can ask for ubuntu specific help in those communities. You can also ask here and on several Linux communities on Lemmy.
The Arch Wiki I find to be more in depth than the ubuntu wiki. Of course some things may differ from Ubuntu’s defaults but I found it a useful resource when using Ubuntu.
Finally I suggest you learn a bit about how Linux works in general, what is in what directory, what is wayland and xorg, understand how drives are named etc and some understanding of the terminal (moving around in directories, how to use sudo etc, no need to learn to make bash scripts).