This document summarizes key lessons learned from cloud migration experiences that should be avoided. It discusses developing realistic project scopes that allow time for discovery and testing. Managing timelines carefully by estimating data transfer times and allowing ample testing periods is important. Avoiding security risks requires reviewing firewalls, intrusion detection, and compliance. Thorough testing that runs the test plan at least three times is crucial. Finally, clear communication of roles, access, expectations for maintenance windows and cutovers is needed.