hiberner-jpa tutorial

https://www.baeldung.com/hibernate-entitymanager
https://howtodoinjava.com/hibernate/hibernate-jpa-2-persistence-annotations-tutorial/
https://www.codejava.net/frameworks/hibernate/java-hibernate-jpa-annotations-tutorial-for-beginners
https://www.springboottutorial.com/hibernate-jpa-tutorial-with-spring-boot-starter-jpa
https://www.springboottutorial.com/hibernate-jpa-tutorial-with-spring-boot-starter-jpa

https://blog.netgloo.com/2014/10/27/using-mysql-in-spring-boot-via-spring-data-jpa-and-hibernate/