how can recovery my MacBookAir

Reloading the macOS software while booted in Recovery mode.  If that is your wish, then this support document explains how to do that–

How to reinstall macOS - Apple Support:

https://support.apple.com/en-us/HT204904

Hello Morilina,

Thank you for reaching out to apple support

I hope you are having a good night!

I wish to help you with your problem, but I do not see the question you are asking. I hope you figure this out.

Best Luck,

R