PM Starter Pack - Practical guide on how to get started in product management
Pramp for Product Managers - Practice product management mock interviews with other PMs
Product School - The global leader in product management training
The PM Interview - Practice PM Interview Questions (w/ timer).
know/how Product Managers - A weekly newsletter with 5 practical tweet-length PM tips
Apply to YC (Y Combinator) - Curated collection of resources for founders applying to YC.