Golem/Wither Hints

Ruined Portals tell the players how to make a Nether Portal, but there is not a structure (or some sort of item, even tho this is not the category for it) that tells the player how you create an iron/copper/snow golem or a wither (except for the wither painting, but it could still use some more support). 

We all know this because of YouTube, but there are always new players that don't know how to make them or don't even know that you CAN make 'em. So it's just logical for it to be in the game.