Hello I know that it will cot much time, but can you create real guide for developers? What I found on ReadTheDocs not informative.
I and many other developers want to know all methods that we have.

For example: I want to create book with images and I do not know? can I use your API or I need to create my own.

The docs expect that you have some knowledge of looking into things yourself. It shows you how to get started, the rest is up to you.