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.
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.
Run by Steve Tan, this Ecommerce Facebook group is super active and busy with over 100,000 members. Discuss genera eCommerce, Shopify/Magento tips, Facebook Ads, Social Media Marketing, information about Product Sourcing, Fulfillment, Traffic and Conversion.
The perfect subreddit for Amazon FBA sellers to have mid to high level discussions about selling on Amazon.
This group by Justin Cener is a general purpose ecommerce group with over 50,000 members where you can learn about dropshipping, influencer marketing, and using FB ads to build an online business.
Run by Ricky Hayes, this is community of 15,000 like-minded 6 & 7 figure entrepreneurs entrepreneurs who are into eCommerce, Shopify, Dropshipping and who are all striving to freedom like yourself.