JPA: One to Many connection

1. https://github.com/AlexP11223/JavaSpringMvcBlog/blob/master/src/main/java/alexp/blog/model/Comment.java
2. https://springframework.guru/spring-boot-web-application-part-3-spring-data-jpa/

Very Very Important:

1. http://www.nakov.com/blog/2016/08/05/creating-a-blog-system-with-spring-mvc-thymeleaf-jpa-and-mysql/
2. https://github.com/AlexP11223/JavaSpringMvcBlog/blob/master/src/main/java/alexp/blog/model/Post.java