Here are the available docs for the Thymeleaf 3 beta. Note that the rest of the documentation hasn't been updated yet for Thymeleaf 3.
These are both learning and reference materials for Thymeleaf. If you want to know how to use Thymeleaf, then start here.
All the Thymeleaf basics: from an introduction to Thymeleaf and how to use it, to a reference of all its processors/utilities. A must read for new and veteran Thymeleaf users.
Docs and reference specific to Spring integration. Be sure to give Using Thymeleaf a read before venturing here.
Finding that Thymeleaf almost meets your needs and you want to push it that little further with your own custom dialects/processors and/or utilities? Then consider this guide your starting point.
Maybe you learn better by doing rather than reading? Then give our interactive tutorial a spin.
Quick glimpses into what Thymeleaf can bring to your project.