For complete training on UserActivation, review all of the resources provided here.
Watch the demo overview. In this video, we walk through the entire process. This will give you a high-level view of the process and behavior of the solution.
Important KB Articles
Read these Knowledge Base articles. They will take you through all prerequisites, and set expectations for what is supported or not supported, so that there are no surprises once you get into the project:
Deep Dive Training Series
Watch the five-part training series for UserActivation. These videos take a deep dive into every aspect of UserActivation to help you understand some of the nuances of the product.
Important KB articles by Source:
Admin Deployment Guide
If you want further information, you can take a look at the Deployment Guide, which goes into a 300-level deep dive into UserActivation