MacBook Air turning on and guest user enabled without user interaction

I’ve been dealing with my MacBook Air turning on without me touching it, or constantly having the guest user turned on after I’ve turned it off, or having commands assigned under accessibility even though I’ve deleted everything. Is there a way for someone to gain access to my system by just plugging it in?

please and thank you.

[Re-Titled by Moderator]

Original Title: Apartment network