Should I turn off my MacBook Air 2020 every day?

With the Mac on power adapter, it can be left to sleep; the AC adapter

and macOS automatically adjusts to not allow Mac to over-charge.

• Get help with your Mac notebook battery - Apple Support

https://support.apple.com/en-us/HT204054

• Log out, sleep, wake, restart, or shut down your Mac - Apple Support

https://support.apple.com/guide/mac-help/log-out-sleep-wake-restart-or-shut-down-mchlp2522/11.0/mac/11.0

There's more articles in Apple Support available to learn about your Mac.

yashna9630 wrote:

..Do I shut it down everyday? Or do I put it to sleep?...

Does not matter which you do.

Does not matter but I shut down daily. Starts up as soon as cover is opened.