100 in 100 Challenge - Get 100 new paid users in 100 days
The Product Folks - A volunteer-led community of product managers and makers
GrowthHackList - 100+ curated growth hacks for makers + early stage startups
Product School - The global leader in product management training
Marketing Examples - A gallery of real world marketing case studies. Updated every day.
Intercom on Product Management - The ultimate resource for aspiring product managers