note this is taken entirely from the slides found at the source, I didn't attend the talk, but still found some useful information worth keeping
Type is a beautiful group of letters, not a group of beautiful letters
Core Ideas
Think in blocks and hierarchies of elements, use consistent rules for individual blocks, rather than trying to layout the typography of the page as a whole
Typography is not a science, do things to your eye
Start with a single typeface that has at least four weights
use contrast
skip a weight to deliniate different types of text (headers, subheaders, and paragraphs)
in doubt, for each type of text, double the size (ex, if paragraph is 25pt, make subheading 50pt and heading 100pt)
strike a good balance with spacing (Calves advises spacing should be 1.2x-1.5x the font size)