https://bezkoder.com/angular-11-spring-boot-jwt-auth/
http://www.nehalist.io/angular-7-models/
https://getbootstrap.com/docs/5.2/getting-started/introduction/
https://www.freakyjolly.com/angular-bootstrap-modal-tutorial-by-example/
https://material.angular.io/cdk/drag-drop/overview
https://angular.io/guide/component-interaction#parent-and-children-communicate-via-a-service
http://gitextensions.github.io/
https://stackoverflow.com/questions/72323848/detached-entity-issue-when-updating-entity-spring-jpa
https://www.npmjs.com/package/ngx-countdown
https://www.baeldung.com/spring-data-repositories
https://vladmihalcea.com/a-beginners-guide-to-jpa-and-hibernate-cascade-types/