The first of the series is simple flame, these are calm controlled fire that are often seen in man made fire sources such as match/lighters or stove fire.

The second in the series is a larger type of fire, its the type of fire that can be seen before it gets out of controlled.

The third in the series is a wild fire effect often seen in forest fire or burning car with dark smoke.

The forth type is an explosion, its a smaller explosion, you probably wont see the shock wave in real life, but I added it anyway for the effects so it is up to you.