Hello. So I am a newbie, you know it. I am designing two games, a text adventure and a gamebook. Because of some reason I am planning to finish my gamebook first. The problem is, I can't seem to find any link that shows me a step-by-step tutorial for gamebook beginners. There is indeed a step-by-step tutorial for text adventure. Is there really no link for it? Or am I just too silly to find it?

Unfortunately, no, not yet anyways. Most people don't use Game Book, as it's much more limited, as it was made for creating CYOA games. You got your Page Objects and Page Links, and that's about it for its design (not much a need for a guide on this stuff). You can do scripting via choosing for the 'page type' for your Page Objects, as: [SCRIPT] or [SCRIPT + TEXT], which then allows you to do scripting, which is mostly the same as it is in/for Text Adventures (which there's plenty of help for using Attributes and the 'if' Script, aka scripting stuff).

Basically... (as I set it)
Gamebook is like the old adventure books...
Read a page,
Do A: goto page 45
Do B: goto page 17
Do C: goto page 124
...