Sigh...... Author I'm not trying to criticize your book because i don't know how good your English is but at least try not to forget about grammar because some of the articles are missing. It may not make an obvious difference to you but to your readers it'll reduce the quality of the book.
Oh and pls when you want to explain something do it at the END of each chapter, it gets annoying if you have to pop up every time the readers are about be immersed in your book.