how many different size bottom brackets are there?

the bottom brackets that are connected to the cranksets im guessing that thats what there called because i do not know. And what are the steps to remove a bottom bracket nd how can you find the size

It will depend on the bottom bracket you have. The size will be printed on the cartridge or stamped on the spindle.

http://bicycletutor.com/part/bottom-bracket/

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