my mac book air m1 gets started after pressing any of the key
why my Mac book air m1 gets restarted after pressing any of the key from the keyboard
MacBook Air
If you mean the screen is blank until you press a key then it comes to life that’s sounds like normal screen blanking and power save activity. You can configure this in Preferences.
If you are seeing a full reboot, starting with the white Apple logo then a login screen which repeats the cycle when you press a key to enter your passphrase there is a problem. Start by making sure your MacBook is fully charged, and if the problem persists you may need to arrange service, Mac - Official Apple Support