Before this class, I knew what classical conditioning was. I knew who Ivan Pavlov was, and what Pavlovian conditioning was. Both my parents have psychology degrees, and talk about the subject occasionally. I think that this is a very important topic in psychology and will be talked about for a very long time.
Pavlov's findings, especially his four concepts of conditioning are extremely important in the basics of conditioning. The unconditioned stimulus, unconditioned response, conditioned stimulus, and conditioned response are important for other types of conditioning, since they provide a stable base in which to start training an animal. Pavlov had shown this with his dogs; he had taught his dogs how to salivate with certain stimulus's, or know when the food was coming. And to think he wasn't even interested in the subject!
Here's a weird/cute/CREEPY video about Pavlov's conditioning techniques: