I remember one time I installed a lot of themes for my session and I broke something and the themes changed my icon files forever and I had to reinstall Ubuntu!!
Should I just stick to changing my wallpaper and other small tweaks? I don’t really like using vanilla Ubuntu anymore, it doesn’t feel like me. Thank you very much!!
As long as you do not use root privileges (indicated by sudo or that password promt pkexec) you cannot destroy the system in a way that can’t be fixed by deleting a few files in the users home directory.