Keep Linux up to date
Updates are the most important security habit on any system. Most attacks rely on a known flaw that's already been fixed, so a machine that's up to date simply isn't vulnerable to them. Linux makes this easy, because one update covers your whole system and most of your apps at once.
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Update from the desktop
Your distribution has a graphical updater, usually called Software or Software & Updates. Open it, install anything waiting, and restart if it asks you to. That's all most people need.
Update from the terminal
If you prefer the terminal, it's two quick commands.
2 steps
Don't forget apps from other sources
Software installed as Flatpak or Snap updates separately, though usually on its own. To update Flatpaks by hand, run flatpak update. Snaps refresh themselves automatically. The next guide shows you how to make security updates automatic so you don't have to remember.
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