hi there, i have a 2011 Mac Air, how do i update my Mac?

Firstly, you'll want to make sure your MacBook Air is compatible with the latest macOS. As of my last update in 2021, macOS Big Sur supports MacBook Air models from 2013 onward, so your 2011 model might not be able to update to the latest version.

However, you can still check for available updates. Click the Apple icon in the top left corner, select "About This Mac", then click "Software Update". If there's an update available, follow the prompts to install it.

Remember to back up your data first! Hit me up if you have more questions!

Just a new Mac. Apple.com/store

The MacBook Air (11-inch, Mid 2011) can be upgraded to macOS 10.13.6 (High Sierra) maximum. If you already have this then there isn't anything you can do other than muguy's suggestion.