Understand the math behind machine learning
Seriously? You did not know? This link has the most valuable reference links in recent. The one I have used is Khan Academy but there are many other ways as they suggest here
http://www.datasciencecentral.com/profiles/blogs/the-mathematics-of-machine-learning
NOTE I now post my TRADING ALERTS into my personal FACEBOOK ACCOUNT and TWITTER. Don't worry as I don't post stupid cat videos or what I eat!