I am DMing a game in which one of the main plot elements involves multiple different factions (several different groups of NPCs in addition to the PCs) searching for pages of a powerful book of lore that was torn apart centuries ago. It is inevitable that the PCs eventually find pages due to the nature of this plot.
My question is about how to implement these pages mechanically and physically. Should I put actual information (images of the planes, true names of demons, portal locations, etc.) in the pages, or should I have them be more mechanical in nature (give bonuses, unlock abilities, etc.)? I think it would be engaging and fun for them if I were able to make physical copies of the pages for them to look at, but I also am not sure if I would be able to think of enough viable information for that to be realistically possible.
What is a good way to implement pages of secrets to players?