What do VFXManager scripts usually do?

Given I want to spawn several VFX in my game like bullets, laser beams, or self healing effects, I would need to put a VFX manager into the scene to handle these effects right? What would such a manager usually do, is it like a situation that when i want to spawn a VFX i would call upon the manager saying "hey this happened, spawn a VFX of this type/this VFX prefab now" ? Or are these managers expected to handle entirely different things as well? I can barely find any good resources on this or maybe my mindset is entirely wrong, any support on the concept would help lots!!