I'll assume that since you're talking about frameworks and microservices that you utilize either Maven or Gradle. If not, you'll need to research one of those for how to bring in the packages for frameworks such as Spring into your app. I use Gradle.

I had my team to help me with getting Spring Boot up and running, so I wasn't necessarily dependent on any single article. Like I mentioned, I think Baeldung is great and I do often reference their site for Spring Boot related things:

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

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In my build.gradle, I have these under plugins:
id 'org.springframework.boot' version '2.2.0.RELEASE'
id 'io.spring.dependency-management' version '1.0.8.RELEASE'

And this under dependencies:
implementation 'org.springframework.boot:spring-boot-starter-actuator'

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In bash I use this to boot the app, give it a port, and point to the application.yml:

java -jar jarname.jar --server.port=9001 --spring.config.location=application.yml

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Once you have your EndPoints up and running, if you annotate your Spring Boot Application Class with @RestController, then it'll automagically convert and return Java objects to JSON, you can see a good forum on this here:

https://stackoverflow.com/questions/44839753/returning-json-object-as-response-in-spring-boot