Domain Driven Design Distilled is the best place to start. It compresses the topic down into only 200 odd pages rather than the other giant books on the subject. I'm reading it at the moment and it's starting to click far more than it ever has.
Also, don't just try to watch conference talks and read blog posts to understand it. It leaves too many gaps and a fuzzy understanding.
“Domain-Driven Design: Tackling Complexity in the Heart of Software“ by Eric Evans seems to be the preeminent book on the subject.
It's valuable, but very hard to read. I would recommend implementing DDD by Vaughn Vernon first. Also understanding event storming helps a lot.
Google videos of Eric Evans and others talking about DDD, Event Storming, and CQRS.