Although not strictly about Ecommerce, Neil Patel's blog is an excellent resource to learn about SEO, digital marketing, conversion optimization, and generating more sales for your ecommerce business.
Refersion's blog about ecommerce marketing shows you how to grow your business by teaching the ins and outs of affiliate marketing.
Ecommerce business blog by Steve Chou, which started out trying replace my wife’s salary of $100K within one year, has excellent advice on how to market and grow an ecommerce store.
ReferralCandy's blog helps you get better at word-of-mouth marketing. Learn from case studies and detailed tutorials to drive more social shares, more customer reviews, etc. for your online business.
Curated takes on eCommerce marketing, trends, and strategies. The Prehook blog guarantees to make you a better DTC marketer.