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.
The Ecommerce Group run by John Lawson is a slightly niche group with around 8,000 members. Join in to discuss strategies and tactics that can help you maximize profits with your Amazon, Shopify and Ecommerce business.
Gabriel St-Germain's private Facebook group for people who are learning about e-commerce, FB ads, IG influencers, and everything in between.
Managed by Trackify, this Ecommerce Facebook group has 50,000+ members and is all about using the right approach and tactics to scale your ecommerce business to 8 figures.
Richard Lazazzera of A Better Lemonade Stand runs Ecommerce Entrepreneurs. With close to 50,000 members, the Facebook group is one of the largest forums for discussion, learning, and growth on Shopify, ecommerce, digital marketing, Adwords, SEO, SEM, web analytics, content, CRM, etc.
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.