ToDo-FullStack-App Frontend resource: https://www.youtube.com/watch?v=TmDNBEdHzVs Backend resource: https://www.bezkoder.com/spring-boot-postgresql-example/ https://www.javaguides.net/2019/01/springboot-postgresql-jpa-hibernate-crud-restful-api-tutorial.html https://blog.tericcabrel.com/validate-request-body-and-parameter-in-spring-boot/ Appliation preview: