This document outlines 20 essential Android app marketing activities including optimizing the app's presence in app stores through things like the title, description, and icon. It also recommends establishing an app website and using SEO, social media, forums, in-app integrations, word-of-mouth, press releases, email marketing, advertisements like in-app ads and app launch sponsorships, exchanging ad space, using analytics, developing a pricing strategy with both trial and paid app versions, and continuously improving the app with new features.