Identifying Strains

alright i was wondering if any of yous could tell me how to identify different types of strains. Because a wicked lot of dealers usually will just call their bud 'dro or they say they don't know what it is. Once in a while i'll hear that some one has White Rhino or AK47 but usually people don't know what their weed is called.
So if anyone could help me out by telling me how to identify a strain thatd'd be nice.

Theres a lot of strains, and i mean A LOT. Theres no way to tell. Theres way to tell if its savita or indica, but then after that its just like yeah. Thats why knowing growers is good.