$ sudo -u postgres psql

\password

Enter password: ...

...

//CHECK POSTGRES IS WORKING OR NOT

sudo systemctl status postgresql

​

//THIS WILL ACCEPT PORTS

sudo pg_isready

sudo su postgres

​

//NAVIGATE TO SQL TERMINAL / BASH

psql

​

//CREATE A NEW USER WITH PASSWORD

CREATE USER yourname WITH PASSWORD 'yourpassword';

connection to server at "localhost" (127.0.0.1), port 5432 failed: FATAL:  password authentication failed for user "postgres"

​