The reason I chose this tutorial was simply because it was relevant in my game. In one of the games 5 levels the theme of the world is the element fire, therefore learning how to create fire and smoke in unity is of great use to me. I also think it would be interesting to mess around the this mechanic and try out a mixture of colours like purple and pink and if it looks as good as I think it will i'll find a way to incorporate it into the game, since a big part of my game is for it to be aesthetically appealing.
(Thumbnail of the tutorial I watched)