How to SUMMON Mobs and Ender Crystals

Hello and today I will be Telling You how to summon Mobs and Ender Crystals. but first I need to tell you what an Ender Crystal is. an Ender Crystal is a little purple cube that is floating Above fire a small peice of BedRock that looks like its Covered in Glass and it Heals the Ender Dragon. so anyway to summon a mob you need to do /summon <Mob name or EnderCrystal> ok so thats how you summon a mob or EnderCrystal but if the mob or the EnderCrystal has two words such has EnderCrystal you will need to not do a space between the two words. oh and you need to do caps for every Letter of a starting word Excep summon. oh and by the way its Impossible to summon Withers.

Well Cya Later.