Check out the official r/Shopify community on Reddit, where Shopify merchants, developers, and partners from the ecosystem come together and help one another.
Alex Fedotoff runs a Facebook group with nearly 50,000 members dedicated to intermediate-advanced Facebook advertisers and eCommerce entrepreneurs, who are spending $5,000 - $1,000,000+ per month on ads. If that's you, this might be the right place to pose problems and learn from marketers.
r/ecommerce is a subreddit for anyone interested in the operations of ecommerce websites. Ask questions, have honest and helpful discussions on marketing, seo, products, checkout, conversions, etc.
Run by Sugatan, this group is designed for people who already have eCommerce businesses and who want to optimize and grow quickly. Learn about Facebook Advertising, Website Performance Optimization (CRO), Marketing Strategies, Native Ads, Store optimization, Email Marketing and more.
EcomHub's official Facebook group is for high-level discussions and all things Amazon FBA & eCommerce strategies.
A Facebook group with 13,000 members run by The Social Sales Girls, with the explicit purpose of teaching Shopify store owners on how to take their product-based businesses to the next level.