I think bad warehousing and distribution and poor customer service are the most common ones. Customers expect to find your products in stock, and when they don’t find them, they become frustrated and do not order again. It’s important to have the right business model, and it’s equally important to have the right team that can provide customer service for the customers, which is very important for any kind of business. So having proper warehousing and distribution leads to a good customer experience , which are the basics and most important things to follow to run a successful online business.