There are soooo many bottom brackets out there. I've attempted to put all types in one video. I'll go over specs/dimensions, types, compatibility, identification, and conversions.
Chapter 1: Vocabulary, 1:22
Chapter 2: Evolution of cranks, 2:35
Chapter 3: Threaded bottom brackets, 5:24
Chapter 4: Threadless versions, 9:01
Chapter 5: Identification, 16:54
Chapter 6: Conversions, 25:31