Getting started

The following documentation comment has been logged on the website:

Page: https://www.postgresql.org/docs/15/user-manag.html
Description:

https://www.postgresql.org/docs/current/tutorial-createdb.html

The "getting started" page skips right from the installing to already having
started the program, but on linux machines, you cannot start psql without
inputting a special command, "sudo -u postgres psql".  Typing psql will make
the program tell you that your username doesn't exist, and you can't create
a username for psql without starting psql first.  I had to search somewhere
else to learn that I had to start psql with that special command.  

https://www.cherryservers.com/blog/how-to-install-and-setup-postgresql-server-on-ubuntu-20-04