EcomHub's official Facebook group is for high-level discussions and all things Amazon FBA & eCommerce strategies.
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.
The definitive r/Marketing community on Reddit, where you can connect with marketing + advertising industry professionals to discuss marketing strategy, media planning, digital, social, search,, email, content, copywriting, segmentation, attribution and more.
A Facebook group with 13,000 members run by The Social Sales Girls, with the explicit purpose of teaching Shopify store owners on how to take their product-based businesses to the next level.
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.
This is the official Shopify Community forums where partners and merchants meet to discuss ideas, get feedback and help, and learn from each other.