Potions: they are inportant for different tasks like speed potion to get to places faster!!! or strenth potion for dealing more damage! regen, damage,health all sorts of potions! Theres 2 catagorys of potions harming or helpfull, Now you use harming for fighting BUT some monsters like harming for example zombies, if you throw a potion of harming at a zombie it will heal them they DONT like healing though! Aswell as the wither and skelitons!!! Helpfull potions such as healing, strenth, speed and haste is great for helping your minecraft experiance!