Pivotal (creators of Spring/Spring Boot, Cloud Foundry and other products) have some free E-Books regarding Microservices and Cloud Foundry technologies which you can find here https://content.pivotal.io/ebooks.
You may be asked to supply a valid email address, your name and some other information before you can download the books. Looks like there is even a few chapters on ASP.NET Core.
“The strongest of all warriors are these two — Time and Patience.” ― Leo Tolstoy, War and Peace
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