Did you know that Pickleball BC/Pickleball Canada has an officiating program? If you are a Pickleball Canada member, after logging in, you can find the information here.
Under "Resources" there is a self-administered rules quiz to test your knowledge of the rules. Take it. It is quite eye opening.
Finally, if you're interested in watching videos of the most recent Pickleball BC introductory refereeing tutorial (November 2020), you can find them on YouTube here.
P.S. There were a bunch of rule changes for 2020. Are you aware of them? In early 2021 expect to hear about 100 more rules changes!