Reload. OS on a MacBook Air
How does one load a new operating in a Mac Book Air or recover the old one. It. Is worthless now.
MacBook Air 13", macOS 10.14
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There is a pathway through this site, with important options that may vary
due to what your mac needs and how far you could get with taken steps.
• About macOS Recovery - Apple Support
https://support.apple.com/en-us/HT201314
Additional installation methods under circumstances that only you may find
to be specific to another desired outcome (from reading &/or trying) are here:
• How to reinstall macOS from macOS Recovery - Apple Support
https://support.apple.com/en-us/HT204904
There are other things to consider or try to do whilst attempting these feats.
However until you get there (any of those 'there' moments) ~ I'm at a loss.