Principles that apply to regular employees but not to managers

Leading people differs significantly from the work of a regular employee. Many people believe that once they are promoted to a managerial position, they can continue doing more or less the same things as before. Perhaps they think they only need to delegate some work occasionally or organize a team meeting. In their view, the principles that guided them previously remain valid. Unfortunately, this is not the case. Which principles apply to regular employees and may even have helped you reach a managerial position, but have a negative impact once you become a manager?