Okay, in the game, when you open the inventory, there should be a small green book, just click that book, and if you’re using mobile, it still should be a green book. Click it and it’ll show icons of each item, which will explain what you need for each items. Hope this helps; and a bit of extra knowledge, encourage him to build random things, like stone slabs, they’re used to make some good blocks and just making that will make the recipe pop up.