OEM Original Back Rear Camera Lens Glass Replacement for iPhone 11 and iPhone 11 Pro and iPhone 11 Pro Max with Reparing Tool

My wife camera lense is broken. I don’t understand why there are three different lense cut outs. Are they for each camera, specifically? I need wide

Where are the instructions??

Do you need some type of adhesive for this?

Will this fit a 12 Pro Max broken camera?