How do you tell tobacco types? Newbie help

Thanks

Essentially what I'm asking, is how do I look at a tobacco and say, "Oh, this is a Virginia, this is a Latkia, this is a Cavendish, this is an English, etc."?

I just want to know how to discern tobaccos, so I can dedicate specific pipes to each tobacco style, and avoid ghosting the flavors.

And how do people decide when they get a tobacco that is a combo, consisting of more than one style?

Kegan