Tea 101
From the plant to a cup you can describe, in the order the ideas depend on each other.
Beginner
1. One plant
Everything else makes more sense once you know all true tea is one species.
2. Why it becomes six things
The categories are decided by what happens to the leaf, not by where it grew.
3. Brewing it
A tea you have brewed badly tells you nothing about the tea.
4. Tasting it
Noticing what is in the cup is what makes the rest of the subject stick.