spring-boot-crud-example | Application Framework library

Firstly: Yes, i know there's lots of this question already asked but no one really helped me much.

Secondly:

-I've tried making a simple Auth with my username+password from MySQL credentials into the Postman but didn't worked

I've tried to remove the cookies from postman and that did not work.

Description:

link where i got the idea: youtube link for this crud web app

I'm trying to develop an simple CRUD web app with Spring Boot, Lombok, JPA and Hibernate, MySQL. Everytime i try to make a POST request into Postman it doesn't give me anything(401 Unathorized), as shown here:

It only gives me "401 Unauthorized".

Of course when i run the project it gives me the DB shown in MYSQL

Here's the project content:(That YML file has nothing in it)

Here's some code:

application.properties