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psql --help

help General Help
\h SQL Command Help
\? psql Command Help

\x

\df

psql -h <localhost or IP> -p <port> -U <username> -d <database name>
NOTE: Most parameters are optional
NOTE: Case is important!

\l

\c <database name>

\d

\dt

\d <table name>

\copy (<query>) TO '<path to file>' DELIMITER ',' CSV HEADER;
e.g. \copy (SELECT * FROM person) TO '/home/jasonl/Desktop/sql/results.csv' DELIMITER ',' CSV HEADER;