I've made a beginner friendly mini course in 4 parts where you will learn how to create a real time explosion in Blender using simple planes and shaders.
No smoke simulation.
It's a good introduction to real time FX in general as you will be able to apply these techniques to create tones of FX in Blender or in your game engine.
All videos are available in this playlist below, and you can get the files for free here.
Hope you will like it!