The green bar under your health and your hunger is the experience bar. If you craft an enchantment table, you can pay experience to enchant tools and weapons.
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The bar at the bottom of your screen during gameplay also known as the "Hotbar".
Because you have a really bad computer and minecraft is using all of the memory.
It should automatically be there.
the 1 - 9 keys
Green:Cook cactus in the furnace to produce "Cactus green".Lime green:Combine cactus green with bonemeal to get lime dye.See the related link below for the official Minecraft crafting guide.