There isn't really a tutorial that I'm aware of.
In short, it's one channel/fixture per dot/pixel in the animation screen. If you have 4 different LED colors on a bush/tree, you are going to have 4 dots.
I forget if it even handles RGB correctly or not.
Personally? I wouldn't focus on the Animation window. I'd focus my time/energy on S5 and the built in Preview. Back when I started (2004/05) that was all we had, and my first animations were nothing more than dots on the screen. The Visualizer (s4) and Preview (s5) are light years ahead (bad pun) of the Animation window. Strongly recommend learning those. (And s5 in particular)