Do I need added security for my MacBook Air?

I'm always getting notifications from Norton Security and others saying I need this.

Those things are scams. Ignore them.

Apple offers plenty of built-in security. You can augment it by following these recommendations:

Set up your Mac to be secure - Apple Support

Protect your Mac from malware - Apple Support

Security features on your MacBook Air - Apple Support

For a technical overview of macOS's built-in protections, read Protecting against malware in macOS - Apple Support

To learn more about how to protect yourself from succumbing to scams, read Effective defenses against malware and other threats

See the articles Set up your Mac to be secure - Apple Support

Security features on your MacBook Pro - Apple Support

Apple Platform Security - Apple Support

Change Security & Privacy General preferences on Mac - Apple Support

Protect your Mac from malware - Apple Support

Uninstall Norton Install and uninstall apps from the Internet or disc on Mac - Apple Support

You don't need Norton Security for a Mac.

Apple has built-in protection against those things. 😉