One of my key goals this year was to gain a good understanding of concurrency and multithreading. I've always had a tangent understanding of it at best. The book Java Concurrency in Practice was one of my first picks.
Hence, to bridge this gap in knowledge & skills, I decided to invest in several concurrency related books & courses. My intention was to start from JCIP and then move on to some additional courses. Initially, I felt that just reading this book won't be sufficient to understand the subject thoroughly.
However, after going through this book I didn't bother looking into any other concurrency course at all. It is one of the most succinct and yet thorough books on a given topic that I've ever read.
Additionally, I would recommend you to go through this book even if you're not using Java at all. It will give you a very profound understanding of whatever framework/mechanism your language of choice uses to tackle concurrency.