The main components of a particle system

Very briefly, the following paragraph (taken from the official Unreal 4 documentation that's available online) very aptly describes the relationship between the different components that are used in particle systems:

"Modules, which define particle behavior and are placed within...Emitters, which are used to emit a specific type of particle for an effect, and any number of which can be placed within a...Particle System, which is an asset available in the Content Browser, and which can then in turn be referenced by an...Emitter Actor, which is a placeable object that exists within your level, controlling where and how the particles are used in your scene.",

Read this several times to make sure that you are clear on the relationship between the different components.

So, as described in the earlier section where we looked at P_Fire, we know that the emitters are labelled as Flames, Embers, Sparks, Smoke, and so on. The different properties of each of the...