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.
All 2018 sessions are dedicated to advanced TDD techniques. We meet on the 26th of February to see episode 19.2 (https://cleancoders.com/episode/clean-code-episode-19-p2/show). "Part 2 is where things really start to get interesting. First we look at the topic of incremental algorithmics; the notion that you can derive an algorithm, one step at a time, by posing a failing test, and then making that test pass."
This time the meetup is hosted and sponsored by Consol (https://www.consol.de/).