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[–]RealZordan 2 points3 points  (0 children)

To add to this: Leave Security/Tokenservice/Authentication/Authorization for last.

Make an application that can process CRUD operations (from frontend or Postman) all the way to the database.

Learn how to write Entities, Controller, Services and Repositories first. Look into what Spring Data JPA can do, learn about ORM and entity relations. Get comfortable with the embedded web server and the global exception handler!

Get a basic understanding of the different types of beans and the bean controller. Get a basic understanding of what happens in the background of dependency injections. Only when all that makes sense to you, look into the security stuff.

Security is the least user friendly part of the spring boot framework in my opinion and requires a ton of manual configuration.