I have a brand new Apple MacBook Air M1. What does Apple Support cover

If bought from Apple directly, you get 1 year warranty for manufacturing issues and defects. Repairs are free if they fall in such categories.

You get 90 days of free telephone support also.

If you mean Apple Care+, you get 2 more years of warranty service for manufacturing defects and you get unlimited repairs and replacements for damage at a reduced service price.

More details see: click here ➡️ AppleCare Products - Mac - Apple