FWIW: If you're asking about marketing after you've built a product, you're doing things in the wrong order. That's why I've included Rob's Start Small, Stay Small as one of core ideas is market validation. From a review: "not about coding but about [finding] a great niche, building a product that executes at a plateau and make it run automatically"

"The other resource I'd recommend is the one I'm releasing in ~3 weeks :)" https://www.julian.com/learn/growth/intro -- julianshapiro | https://news.ycombinator.com/item?id=14026863

Secret Sauce: The Ultimate Growth Hacking Guide "the only actionable Internet marketing guide out there" (2017) $40 https://www.secretsaucenow.com/ -- austenallred | https://news.ycombinator.com/item?id=13807171

Marketing for Developers "Don’t build another software product no one uses. Discover what people will pay for before you start coding." (2015) $39 https://gumroad.com/l/devmarketingbook -- mijustin | https://news.ycombinator.com/item?id=12034104

Traction: How Any Startup Can Achieve Explosive Customer Growth "I started doing a series of interviews on my blog with successful founders about how they got traction" (2015, 2nd ed.) $15 https://amzn.com/dp/B00TY3ZOMS -- epi0Bauqu / yegg | https://news.ycombinator.com/item?id=10346268

Start Small, Stay Small: A Developer's Guide to Launching a Startup "The book is approaching 11,000 copies sold to date, so it's obviously filled a need." (2010) $10 https://amzn.com/dp/B003YH9MMI -- rwalling | https://news.ycombinator.com/item?id=5361601

These guys all use their own techniques so they love bundling additional stuff besides the ebooks.