i want to completely reset my computer and re login to everything. how would i do that

How to erase your Intel-based Mac - https://support.apple.com/HT208496

How to erase a Mac with Apple silicon --> https://support.apple.com/HT212030

I bough a new macbook air i want to log off from that macbook and reset to give it to my daughter. and my email hide and i can not return back.