If you're new to the ecommerce game and just about to make the plunge, Shopify Newbies is a strong group with close to 100,000 members that can help you get started on your Shopify ecommerce business journey.
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.
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.
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.
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.