How does one enable authentication for YugaByte DB YSQL API?

I was trying to use the instructions for installing a local cluster using: https://docs.yugabyte.com/latest/quick-start/install/#linux, but could not find documentation on enabling authentication.

See https://docs.yugabyte.com/latest/secure/authentication/ysql-authentication/#start-local-clusters — enabling authentication is not included in the Quick Start.

Adam,
Documentation for authentication can be found here:
Enable YSQL Authentication
Enable client access to YSQL databases

Hope this helps.
–Alan