Tea is like wine. It seems when you open one door, there are ten more in front of you. Don't be discouraged. The path of tea is a lifetime of learning. If you're new to tea, welcome! Once you step foot on the path, you have traversed it in its entirety.
A miracle of a beverage, all orthodox "teas" come from the same plant, Camellia sinensis. The magic is in the craftsmanship. Depending on the process used, the same leaf could become green, white, oolong, black, or puer tea.