This document outlines 4 common cybersecurity mistakes that small and medium-sized businesses make that leave them vulnerable to attacks. These include not properly training employees, allowing employees to use personal devices for work without a BYOD policy, relying on a single in-house IT person instead of an managed service provider, and failing to have a disaster recovery plan in place. The document provides examples of the risks associated with each mistake and promotes partnering with an MSP for comprehensive security assistance.