What to do at the boot: prompt

Once the install process starts and you get the initial boot: prompt, as long as you have fairly standard hardware, here are the most common responses:

boot: ENTER                 standard, graphical install
boot: linux text            non-graphical install
boot: linux lowres          low resolution (640x480)
boot: linux mediacheck      verify (md5sum) CDs first

You can also do nothing, which will eventually cause a timeout and is equivalent to just hitting ENTER. There are, of course, numerous other possibilities, but these should cover you 98% of the time.