Best Tutorial: Many-many relationship with extra columns in JPA

1. https://huongdanjava.com/many-many-relationship-extra-columns-jpa.html
2. http://www.javamakeuse.com/2015/01/hibernate-many-to-many-mapping-with.html
3. https://www.thoughts-on-java.org/many-relationships-additional-properties/
4. https://en.wikibooks.org/wiki/Java_Persistence/ManyToMany
5. https://giannigar.wordpress.com/2009/09/04/mapping-a-many-to-many-join-table-with-extra-column-using-jpa/
6. https://stackoverflow.com/questions/5127129/mapping-many-to-many-association-table-with-extra-columns
7. https://vladmihalcea.com/the-best-way-to-map-a-many-to-many-association-with-extra-columns-when-using-jpa-and-hibernate/