New to Ubuntu and KDE Plasma—what should I know before using it every day?

You may not need the terminal very often at first. Use the graphical updater for regular system updates, read commands before running them, and be cautious with guides that tell you to add unfamiliar repositories or paste long scripts as administrator. For applications, Flatpak can be a convenient option because it keeps many apps separate from core system components, while the system package manager can handle Ubuntu, KDE, kernel, and other operating-system updates. If you’re using a long-term-support release, that’s generally a calmer choice for a daily driver than an interim release.

You’ll probably be fine as long as you stick with the normal stable updates and avoid removing or changing system packages without knowing what they do. There’s an old joke about removing a particular language pack breaking the desktop, so it’s best not to delete random packages just to clean things up. Enjoy the new setup!

The safest approach is to make one change at a time and keep a recovery plan. Back up important files, learn what commands like pwd, ls, cd, cp, mv, mkdir, and man do, and practice in a throwaway folder rather than experimenting with system directories. Avoid advanced desktop replacements or major configuration changes until you understand how to undo them. Most problems come from following commands blindly, using administrator privileges unnecessarily, or mixing instructions from different Ubuntu releases.