Start treating inbound.org and growthhackers.com like you treat Hacker News. Everything else will take care of itself.
I think of them as Hacker News for marketing. Inbound.org is run by Hubspot and Sean Ellis runs Growth Hackers.
/r/juststart is good to read for for practical examples. blackhatworld is good too - I would go to the source of good information (SEO, Affiliate forums - peoeple who actually own products that need growthacking rather than consultants) instead of "thought leadership" forums