Insufficient explanation for beginners

I can not fully connect the (mostly) positive reviews of the previous speakers.
The reason for this is that some things (be declared or not) in my opinion, insufficient. Specifically, it is me here about how to complete a lap, to avoid steps when changing colors and is generally a question of what to do when a color change. A picture would have been very helpful here.
For a somewhat experienced Häkler that's probably ridiculously easy, which is why it was possibly not explained in this book, for me as an absolute beginner of color change and final round were not, however, understandable.