Growth Hacker Marketing - Ryan Holiday's book, re-released and expanded
GrowthHackList - 100+ curated growth hacks for makers + early stage startups
Your Growth Hacks Aren't Working - Free new book by Steli Efti on B2B customer acquisition
Master of Letters Podcast - Learn what others are doing to drive traffic to their site
Spacedoo - Short actionable marketing hacks
KeywordTool.io - KeywordTool.io is the best FREE alternative to Google Keyword Planner and Ubersuggest. It uses Google's autocomplete feature to get over 750+ long-tail keywords for any given query.