Run by Jonathan Kennedy of HeyCarson, Shopify Entrepreneurs is one the largest and most active ecommerce communities on the internet. With over 100,000 members, join this community to talk about all things ecommerce across every kind of topic.
While not specifically about ecommerce, r/smallbusiness is a great place to ask questions and learn from others who are starting, owning and growing a small business.
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.
This is a free community for Facebook marketers, freelancers and agency owners. With over 100,000 members, the group is run and moderated by Digital Distillery & Cat Howell.
Gabriel St-Germain's private Facebook group for people who are learning about e-commerce, FB ads, IG influencers, and everything in between.
VerumEcom focuses on providing high-quality training and resources for people looking to either start their first e-commerce business or take their existing business to the next level.