The RYA have a number of rules videos on their YouTube channel that might be of interest.
Series 1 dealt with the rules and starts at  https://www.youtube.com/watch?v=tFCuwTuW200 and is for those with little rules knowledge (they said it!)
They are now into series 2 and the episode on Team Racing is at https://www.youtube.com/watch?v=k9Z2MLnzdTc
The episode on Match racing https://www.youtube.com/watch?v=ltlNp1l7TSw at Premiers on Nov 11 1900 GMT
There is also one on Windsurfing rules.