I second raptir’s note about running zypper dup in the terminal to do system updates. Zypper’s a bit slow because it lacks parallel downloads, but it provides good info if there are any issues.
If you plan to use flatpaks, add the flathub repo with the --user option, and use that one to install. If I didn’t go that route, it prompted me to enter my password for every flatpak app with an update. I’m also a deplorable Plasma user 😜, I don’t know if the same behavior happens with Gnome software, it may be a weird Discover thing (shrugs).
Also, if you need the non-free multimedia codecs, run the following commands:
zypper install opi
opi codecs
Automates adding the Packman repo & switching the relevant packages.
Those are the main quirks I learned with Tumbleweed.