I can only see the monsters list but the book has several pages explaining things from the monsters blocks. Isn’t that here? Or how can I access that information?

Never mind, just noticed the view introduction button…but honestly this could be added as a chapter to avoid any confusion 

It's not a chapter in the physical book, so it isn't going to be one on here.

I get it, but the problems is that not every book here has the "view introduction" button but some has the introdocution mentioned on the chapters list. Here's spot the differences. 

Here's the PHB page: 

Here's the Monsters Manual:

Point is: If you are not familiariazed with the printed version, you might miss that very important piece of information. 

Even some other books has a preface button before the monsters list. Just saying...