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Navigate History
You'll often want to re-run a command. You could just type it out again, but assuming you don't have the WPM of ThePrimeagen, that's a pain.
Arrow Keys
You can use the ↑ and ↓ arrows to quickly cycle through your command history.
Pressing the ↑ key walks backward through the commands you've run, one at a time. Once you've gone too far back, the ↓ key walks you forward again toward your most recent command. It's a huge time-saver: instead of retyping a long command, you just arrow up to it and press Enter.
Clear
If your terminal is feeling cluttered with text, you can clear it with the clear command, or by pressing Ctrl+L.
This won't delete your history, it will just clear the screen.