Best marketing books for a software/tech startup like ours — what's actually worked for you?

I'm part of the team at BetaxLab — a small but fast-growing tech startup focused on building innovative software products. We're at that stage where we've validated our product and now need to get serious about marketing, growth, and building a real brand.

I've been going down a rabbit hole of book recommendations but there's so much out there — and a lot of it feels either too generic or aimed at huge enterprise companies.

So I wanted to ask the community: what marketing books have actually moved the needle for you at a startup/early-stage company?

Here are a few I've already come across:

• Traction by Gabriel Weinberg — for finding the right growth channels
• Hooked by Nir Eyal — product-led growth thinking
• Influence by Robert Cialdini — psychology of persuasion
• This Is Marketing by Seth Godin — brand & audience building

But I'd love recommendations specifically around:

✅ B2B SaaS / product marketing ✅ Content marketing & SEO for startups ✅ Building a brand from scratch with limited budget ✅ Community-led or word-of-mouth growth

Would love to hear from founders, marketers, or anyone who's been in the early-stage grind. Drop your go-to picks below — and bonus points if you explain why it helped you specifically! 🙏