Java
ENUM:
- https://stackoverflow.com/questions/18883646/java-enum-methods/18883717
- https://www.geeksforgeeks.org/enum-in-java/
- http://www.ntu.edu.sg/home/ehchua/programming/java/javaenum.html
- https://www.youtube.com/watch?v=sI4utYmh7O4
- https://www.youtube.com/watch?v=KOAsLaK4Wzw
- https://www.youtube.com/watch?v=ThN8IXr0n_k
JPA:
- https://www.petrikainulainen.net/spring-data-jpa-tutorial/
- https://stackabuse.com/guide-to-spring-data-jpa/
- https://spring.io/projects/spring-data-jpa#learn
??
Intro: https://www.techiediaries.com/angular-tutorial-basics/ Course: https://www.udemy.com/the-complete-guide-to-angular-2/