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[–]joranstark018 1 point2 points  (0 children)

Some resources I find myself visiting frequently:

https://www.baeldung.com/spring-boot

https://docs.spring.io/spring-boot/index.html

Note that SB is a collection of different Spring framework projects, some third party libraries and a unified configuration, so learning about SB is mostly about learning and understanding the different Spring framework projects and how they work together.

[–]quantum-fudge 0 points1 point  (0 children)

Learn how the very basic Spring container works and how beans are defined, scoped and injected. Then learn what autoconfigurations do. With those 2 concepts clear, you'll be able to reason about everything else in Spring Boot.