Zen Founder - A weekly podcast about staying sane while starting up
Product Manager Handbook - Interviews w/ product managers + weekly newsletter
Starter Story - Learn how others are building successful e-commerce businesses.
PM Starter Pack - Practical guide on how to get started in product management
Mixergy Startup Stories - Learn from 1000+ interviews including the Product Hunt story
Everything.PM - 300+ resources & tools for PMs, sorted by votes