You should add data base config (username, database name, and password)
Then you should Execute the code by ( npm start ) command
$npmstart
If you want to use the website globally, you need to create global database like create data base on heroku website, then add the data base config ( username, data base name, password, host ,port ..) in the code.
We use backend TDD
We use postgres database to insert,select and delete data
We use validation and authentication for admin information