I have been out of the SEO game for a while (since last summer). I was running auto blogs and making a few hundred a month of it (Google Adsense) but since had gone to make my revenue elsewhere. I'm deciding to go back to SEO just so I can have revenue coming from multiple places. It seems like a lot has changed since last year and I am not 100% sure where to start. Should I go back to Adsense and start more auto blogs? Or should I focus on a product and sell it?