GrowthHackList - 100+ curated growth hacks for makers + early stage startups
Moz Pro - Moz Pro is a PRO version that offers a complete SEO toolset that improves search engine ranking and visibility.
Growth Hacker Marketing - Ryan Holiday's book, re-released and expanded
GetKeywords.io - Free Intent-focused local Keyword Research for everyone
Ryan Holiday - We Invest $500k in Sci-Fi Founders.
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.