How Would I Make an AI System

So I’m working on a new game where its a PVPVE and I don’t have a clue how to make the idea. All im wondering is how other people did there AI and if they where able to make there AI move smooth with pathfinding, When I use pathfinding I have so much stutters and the AI seems slow. Or if there are other ways.

If you can assist in my little research I apricate it.

Edit: I was playing a game called Those Who Remain its fairly well known but there AI seems good.

Use one path until there’s a view of the character using raycasts. Use magnitude checks too, and optionally have custom paths if you really wanted.

If the target is insight, then just follow it. No need for pathfinding. If the target is hidden through, then you should use pathfinding and only use one path until another target is found or until the path reaches the target.