I can’t open my MacBook Air

Is the screen blank, or are you completely unable to turn it on?

Read both:

If your Mac doesn't turn on - Apple Support

If your Mac starts up to a blank screen - Apple Support

Please review this Apple Support article and see if it helps: If you forgot your Mac login password - Apple Support

Your Keychain password is the same as your Mac's login password. Please review my previous post regarding how to reset your Mac's login password.

What shows is my name and no remembered password opens it. I guess I have forgotten my password.

I received a prompt for the insertion of the “login” keychain password. I do not remember it. How can I recover it?