Clickbank University (CBU) has some pretty good affiliate training, but not my #1 choice. I've been doing this stuff for almost a decade now. If you want to be an affiliate and build affiliate websites, then you are better off learning about that stuff from this affiliate training center. They've been around for 15 years, and have produced thousands of success stories (some of which I've personally mentored, since 2012).
The webinars are good, and it's nice that you can ask any question you want. However, they are not very organized. I listened to one from August, which was just an audio recording with a bunch of random questions. I think if they had a weekly topic that was focused on a portion of building an online business, then it would be easier to search through the topics to find things that interest you. How are we supposed to take advantage of these webinar recordings when they are all just random topics from the entire world of online marketing?