Psql not connecting

Hi,
I am trying to connect to the Postgres SQL, but its giving me this error.

I used this command:

psql --username=freecodecamp --dbname=postgres

Error:
psql: error: connection to server on socket “/var/run/postgresql/.s.PGSQL.5432” failed: No such file or directory
Is the server running locally and accepting connections on that socket?