Uncle Bob's videos are the classics of the genre. They explain the craft, methods and reasons with absolute clarity. They are a great source of knowledge and motivation to become a cleaner coder. They are entertaining, perfect for the beginners but they also have enough ideas interesting for experienced programmers.
The next 2018 sessions are dedicated to TDD techniques. We meet on the 11th of June to see episode 23 (https://cleancoders.com/episode/clean-code-episode-23-p1/show). " In this episode we're going to learn about Test Doubles and Mocking."
This time the meetup is hosted and sponsored by Consol GmbH (https://www.consol.com/).