This document outlines 15 psychological tips for improving online sales. It begins with an introduction to the topic of web psychology and barriers to online purchasing such as risk, trust, and privacy concerns. It then asks three key questions about defining a business, target market, and website goals. The bulk of the document lists and describes the 15 tips, which include techniques like creating a sense of scarcity, establishing authority and credibility, using social proof like testimonials, ensuring security, and employing the power of contrast. The overall document provides research-backed recommendations for online retailers to utilize psychology and persuasion to increase sales and conversions.