Ok, so it’s not your wifi driver, it’s just your proximity to the router. I haven’t heard anyone having range issues, that may be something to contact support about. My instructions were not wifi specific.
There are two types of user accounts in Linux: users and superusers. Installing linux gives you access to two accounts by default: the account you named on install (a user), and root (a superuser). a ‘root shell’, ‘admin shell’, or anything ‘as administrator’ just means the command can change system files in some way. One way to do that is with sudo (which, by the way, is short for SuperUserDO): if your user is a subtype of user called a ‘sudoer’ (which your account is by default), you can run one command like a superuser just by running it as sudo and entering your password. Another is to just have a superuser (root) run the command. Again, many ways to accomplish any one task.
Correct! That’s pretty much all of the terminal knowledge you need to follow guides, to be honest. They tell you to run commands, some of them are run as root, and some of them are chained together with &&.
As in it doesn’t get bright enough for you, or there is absolutely no change? Try holding the fn key (left of the windows key) and pressing F7 or F8 (brightness down or up). There is a known problem on 12th gen with brightness keys not working: [RESPONDED] Ubuntu 22 brightness keys not working - #7 by Matt_Hartley