Set The font-family of the h3 elements inside
<div class="learn more">..</div> to 'Shift',sans-serif But I Did!
Am I Supposed To DoIt In Index.html Or Main.css?
You are adding CSS code so you put that in the main.css file.
Have a look at this thread: http://discuss.codecademy.com/t/6-and-8-common-problems/9999 and if that doesn't help, come back and let me know.