The always brilliant Jeffrey Zeldman sums up 2015 (and looks into 2016) with some bullet points. Two of my favorite:
90 percent of design is typography. And the other 90 percent is whitespace.
Don’t design to prove you’re clever. Design to make the user think she is.
See the full list here: http://www.zeldman.com/2015/12/24/the-year-in-design/.