The book module is present in the core. This was already so in Drupal 7. It allows you to show content with a related paging system. For large content it is usefull.
After activating you see a content type 'book page'.
You can use that or start a new one. Every content type can be used in a book format.
I made some nodes with 'pictures' as subject.
Now i make first a global page. Let's say an introduction to the book. I promote this node to a book.
It looks lika a normal page, but you can add child pages...
The nodes i have already made, i now use as child pages to the book.
Automatically these pages are linked.
When looking at one page the other links are present. Previous, next, up...
With the structure tab you can configurate the order of the child pages. Child pages can have their own child pages. Up to 9 times...Keep it simple.