This book is available free of cost on GitHub and you could have downloaded it from there:
Sometimes it is easier to read a physical copy of a book rather than a digital copy.
Additionally by purchasing the physical copy you are supporting the author for their efforts of gathering all this information in one place and explaining it in simple terms.
Yeah, I tend to agree with you on this. Reading a physical copy of a book has this way of putting you all in the moment you know and it's much easier, seriously. You tend to be soaked in and its more safe health wise. You dknt have light stationed in uour face all day and your 0hone battery stays safe. You know how it's way more pressure on your phone or device yo keep the lights on all through the reading section, lots of taps to the screen to ensure some sort of activity. I know the world is going more digital and a digital book might seem a very niece idea but physical books has a thing about them.
As for the listed books, I guess I'll be getting my hands on a few sooner than later.