Trapcode Particular Plugin [patched] — After Effects
Ignore the sliders temporarily. Open the Designer. It is a flowchart. You can drag "Blocks" (Emitter, Physics, Particle, Aux) onto a canvas and connect them. For beginners, this is the fastest way to learn because you see real-time previews of your logic chain.
3D Particle System Plugin for After Effects | Red Giant Trapcode…
This defines where particles come from.