Overall I'd say the best book about microservices is Chris Richardson's Microservices Patterns (https://www.manning.com/books/microservices-patterns). That book will get you covered with everything you need to know about designing and building microservices, and also the various strategies you can use to integrate them. The examples are in Java, but even without being a Java dev it shouldn't be difficult to follow.

I'd still recommend Sam Newman's classic Building Microservices (https://www.oreilly.com/library/view/building-microservices/...) as it describes very clearly the main principles for designing robust microservices architectures. If you wanted to learn how to migrate a monolith to a microservices architecture, you can also checkout Newman's more recent Monolith to Microservices (https://www.oreilly.com/library/view/monolith-to-microservic...).

If you want a more practical approach with JavaScript examples, I'd recommend Ashley Davis' Bootstrapping Microservices with Docker, Kubernetes, and Terraform (https://www.manning.com/books/bootstrapping-microservices-wi...).

Finally, if you wanted a practical approach with more emphasis on API integrations and examples in Python, I'd recommend Microservices APIs in Python (https://www.manning.com/books/developing-microservice-apis-w... - disclosure - I'm the author). You can download two free chapters from this URL: https://www.microapis.io/resources/microservice-apis-in-pyth...

It goes without saying that there're a lot more resources about microservices, and many of them excellent, but these are the books I'd recommend to get started.