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.
Check out the official r/Shopify community on Reddit, where Shopify merchants, developers, and partners from the ecosystem come together and help one another.
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.
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.
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.
Powered by Privy, the Ecommerce Marketing Community is a group designed to let you connect with other founders growing their brands from $0 to $1 million in sales. Join in early as this private group is yet to cross 1,000 members.