Build Your REST API with Spring course. I published my first REST with Spring tutorials over four years ago, and after 900,000 readers and over a thousand personal questions via email, I finally realized that there was a huge tutorial gap in the ecosystem. I had to learn what makes a good API hard, and I couldn’t find anything that would help me speed things up. It took me 3 years, over 10 production-grade APIs built from scratch, and a significant number of mistakes for me to fully understand how to do a really good API. Sure there were tutorials and random code samples, but nothing coherent. Nothing starts out as a guide through the challenges of building a mature API with Spring. The education gap between the API novice and professional remains wide. The web landscape has changed significantly over the past few years, and REST APIs have grown exponentially. Today, most non-trivial applications require exposing an API, and this trend is only increasing. The APIs are also public, which means you have to get them right from the start, as they are very expensive to change. There’s never been a better time to learn the ins and outs of REST with Spring.