Can I have two accounts on my Iphone

No, only one Apple ID is logged into the phone and when you log out of your Apple ID, all the apps remain on your phone. There is no way to have 2 accounts where they would show apps for each user. The phone is a single user device and has never been intended to be used by 2 different users.

There is only one Passcode that can be used to sign into your phone. You can allow 2 faces to be used for Face ID, but it is only for the single account and there is no way to have a different Face option to sign in a different user.

The Mac is a multi-user device because it is commonly used by different family members in a home environment, but an iPhone is a personal device for a single person. The phone calls and messages that are received on the phone are intended for you only.

No, as in you cannot use 2 accounts like that.

An iPhone is a single user device and only one Apple ID can be logged in at a time.

Logging in a different one will require logging out the existing one and will normally result in the first account getting locked out for 90 days from the device.

Your question was......

I want to know if it’s possible to have two accounts on one phone where he can install and play whatever he wants without having to interfere with what I have going on and not being able to see and I mean different accounts as to where he can use his Face ID on his own acc and I use mine in my acc I have an iPhone 13 Pro.

The answer was and is......

No, it is not possible "to have two accounts......"

No