There is no right way to do Spring Boot.The entire idea is broken.

Dependency injection is good. It makes it possible to test stuff.

Automagic wiring of dependencies based on annotations is bad and horrible.

If you want to do dependency injection, you should do it the way Go programs do it. Create the types you need in your main method and pass them into the constructors that need them.

When you write tests and you want to inject something else, then create something else and pass that in.

But the idea that you create magic containers and then decorate packages or classes or methods or fields somewhere and then stuff suddenly gets wired into something else via reflection magic is a maintenance nightmare. This is particularly true when some bean is missing, and the one guy who knows which random package out of hundreds has that bean in it is on vacation and the poor schmucks on his team have no clue why their stuff doesn't work.

"I added Spring Boot to our messy Java project."

"Now you have 3 problems."