Cross breeding of every mob

There should be a breeding system like horse and mules that will create a new mob which have the both parents qualities. Iron golems should also be breeded because like animals it is loyal to player and villagers, we can feed him leash him so, it should also be breeded. And there should be a crafting recepie book for brewing potions , for enchantments and for flenching because new players don't know how to do it. It is very essential.