I understand that you're inexperienced and trying to learn. But learning requires effort. I don't think a complete reinstallation is necessary, but you seemed to be wanting to do that, and it's fine if you want, or don't want to. Being older isn't an excuse for anything in and of itself. I'm 80, and I don't expect my age to have anything to do with anything. I'm willing to help, but I can't do it all by myself from here. If you have timeshift backups, you don't need to worry too much about breaking things, you can always restore again, or you can do a complete reinstall, which shouldn't be that big a deal if you have a relatively new installation. The best way to learn is to break things and then fix them. That has been my M. O. for years.