How do I stop collisions between players and npcs?

Every single solution I try for this never works.
I am trying to stop the player from colliding with a npc, and I don’t know how to stop it. No matter if I try giving them different collision groups, etc. I have also tried using a script that was on the forum, which also didn’t work.

Giving players and npcs different collision groups won’t necessarily make them not collide with each other.
I would recommend reading this page:
(Scroll down to the Collision Groups category)

I hope this helps!