What are the most important sales skills or perspectives that others inside an organization could benefit from that would improve their day to day work?

The most important sales skills that others inside your organization could benefit from that would improve their day to day work are a deep understanding of the customer. Why does someone inquire? Why do they purchase? When you're not in the room, how do they explain your product or sell your product to their boss? How do they use your tool, service or software to solve a problem? By understanding your customers, it helps identify opportunities for upselling, cross selling or even suggesting relevant products. It's 100% essential in today's world.