i dont get how enchantment tables work
i only got it too work 1 time
a good way to place bookshelves around enchantment tables are
X X X X X
X X
X T X
X X
X X X X X
X=shelf T=table
then make another layer of shelves, this gives you the full usage to almost all the enchanting levels
speaking of that, you need to kill to enchant, the XP and level thing, the green bar, raises depends how how many/what type of enemy you kill. levels = level of enchanting for enchantment. there are several benefits to enchanting, like efficiency, fortune, etc.