Just a very short message to direct you to my article on statistical significance over on the Kissmetrics blog. The emphasis is on intuitive means to understanding the key ideas.
Check Out My Guide to Statistical Significance on Kissmetrics
Fun, example-filled guide, aimed at building intuition
More Articles: Click here for full archive
Where I try to convince you that advertising isn't always an annoyance (and that you shouldn't be afraid of ad blockers)
Ways metrics mislead you; how to overcome low reach/low quality score/high CPC etc.
Rich snippets and all the basics about keywords in title tags, URLs, etc.