First time mom question!! Help!

Okay so I’m a first time mom (well going to be VERY SOON) and I’m kinda freaking out! I don’t really feel ready but at the same time I do lol it’s weird.

But anyway my question is, when changing the baby’s diaper, I’m having a boy btw, what is the difference between all these creams? I have A&D, destin, and aquaphor. I know they all are for diaper rash but like, do they all do the same thing? Or is one used for like more severe diaper rash?! Which one is better to prevent diaper rash?! Please help lol