Alright, it works kind of like the following: When you get an item in the description it says what type of item it is. Depending on the type it does different things. Here is a list of types I can think of:
Food: Can have up to 10 uses. When used refreshes the page. Adds n to any varible or varibles. Ability to put in more than one place. (Food shop in Jamaca and In Your Fridge for example but at the same time)
Key: With a key you can get access to a page that you didn't before.
Helmet: Can only have 1 at a time. Rest go into a different part of the inventory where you can equip them there. Increase a varible when equipped.
Shield: Same as Helmet
Body: Same as Helmet
Feet: Same as Helmet
Legs: Same as Helmet
Shirt: Same as Helmet
Gloves: Same as Helmet
Main Weapon: Same as Helmet
Secondary Weapons: Can have as much as the person wants equipped. Have a set use amount. (Under 11) Can only be used in battle or pages described by the maker.
Book: Remembers the page you are on and goes to a chapter that can only be opened by using that page. When you click on the item again you go back to page where you just used it.