$ psql --username postgres --dbname postgres # provide password
== make new user ==
psql> CREATE USER example_user;
== add password for user ==
psql> ALTER USER example_user WITH ENCRYPTED PASSWORD 'example1';
psql> ALTER USER example_user WITH CREATEDB;
psql> \q
open /etc/postgresql/NUMBER/main/pg_hba.conf.
replace 'peer' with 'scram-sha-256'. save and exit.
$ service postgresql restart
$ psql --username example_user --dbname postgres
Follow steps from postgres_script.txt