For me the bottom line of this video is: Microservices come with a huge amount of challenges, that you do not have with a monolith. Chris covers a lot of topics, each of which deserve a number of dedicated videos.
Here is a rather interesting video from Martin Kleppmann where he talks about dealing with concurrent changes to data. While the title may sound theoretical to some, it is a topic that probably every developer has come across. And here is also the link to the paper with the algorithm presented. If you are interested in an implementation, check this Github project.