#1.Gün - Variables, If-Else, Arrays, Loop, Value and Referance Type
#2.Gün - Object Oriented Programming
#3.Gün - Encapsulation, Inheritance
#4.Gün - Interface
#5.Gün - N-tier Layer
#6.Gün - Spring Boot
#7.Gün - Swagger
#8.Gün - One to Many Relationship, Sorted and Pagination
#9.Gün - Data Transfer Object (Dto) and Validation