According to the document, there are four main types of learning: perceptual learning, stimulus-response learning, motor learning, and relational learning. Perceptual learning involves learning to recognize and categorize stimuli, while stimulus-response learning establishes connections between perception and movement to form behaviors in response to stimuli. Motor learning is a component of stimulus-response learning that establishes changes in motor systems through interaction with the environment. Relational learning connects individual stimuli to understand relationships between them.