Tell us about yourself!
Nearly all house keys are made of brass or nickel plated brass, so they don't rust or corrode. No need to mention rust prevention in those ~4 or so examples.
The structure of the webserver has changed since this instructable. You will need to adjust any scripts that place files in /var/www to place them in /var/www/html.
Oops, see that the author has already replied, disregard
th.c is attached that step in the Instructable.
th.c is attached to that step in the Instructable