Topics covered in this Repo :

1.Basics of controllers. 2.Basics of Spring DI. 3.Query Formation in Spring Data JPA. 4.Mappers Inteface(Entity and DTO classes conversions). 5.ControllerAdvice for globally and ExceptionalHanlder usage for both globally and controller-specific. 6.Establish connection with MySQL DB. 7.Paginations in lists.