I found the book The Art Of Web Assembly [1] to really help me understand it better. A lot of other books seem to focus on a specific part of the tool chain. This one shows you all of the examples in web assembly text language. While I wouldn’t want to write a program in it, reading it with the context provided by the author really helped me understand what is going on. It also helped me understand why so many things are the way they are in the current iteration of the WASM world.

[1]https://www.amazon.com/dp/1718501447