Attaching particle effect to an entity

[Theronguard]

Hi, I'd like to attach a particle to an entity but I don't know how. I found this: Category
But I'm getting errors even if I just put the bare script from the wiki in my SWEP (Im trying to attach an effect to an entity launched by a weapon) Is there any other way to attach it? I have 0 knowledge about particles so I'm looking for something like a tutorial to get started rather than a direct answer for the errors in my script (that's why I'm not posting the code). Any help will be appreciated.

[LoweChaser]

Particles Thread will give you some basic info. Use ParticleEffectAttach

[Theronguard]

Thank you