My MacBook air is not getting started there is an gloab rotating I need to know why isn't it getting started

Internet Recovery—can take some time to load fully.

If your Networks download speed is suspect, try a faster Network.

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

If you are having further issues, state what those are...

Boot into Internet Recovery (Option Command R) and from the dropdown menu: Utilities>  Disk Utility> run the First Aid on your Macintosh HD (and the "Macintosh HD-Data" volume as well if Catalina/Big Sur) If errors are found and repaired, run again until no errors reported.

Disk Utility>View>Show All Devices The best sequence is —

• Volume level

• Container level

• Parent drive