This document outlines 5 e-commerce marketing and business mistakes to avoid. These include neglecting mobile optimization by not having a responsive website for mobile shopping, ignoring search engine optimization which can reduce online visibility, having poor product descriptions and low quality images that deter customers, neglecting customer reviews and feedback which can harm reputation, and overlooking analytics and data analysis which results in missed opportunities to optimize strategy. The document emphasizes the importance of mobile optimization, SEO, detailed product content, authentic customer reviews, and analyzing website and customer data.