You could put some examples of customizing the repository with @Query annotations, when I was looking for a way to customize my repository queries, I found some ways to do this, like creating a custom repository interface and then the implementation of this interface, but it uses at least 2 new files for repository and I thought that with the natural growing of a project this could be a problem, so I found that you could use the @Query annotation in your repository to perform custom queries and it was great. Maybe you could include this in your tutorial.