What are the big mistakes of Managers?

Management is very important in every field of life. No organization, no company can survive without managers.
Today we are going to discuss the big mistakes of managers.
One of my connections found these big mistakes for managers. These mistakes are mentioned below:

Lack of communication:
In any industry, at any level, communication is key to being a successful manager. Employees need to know what is expected of them and when specific projects or tasks need to be completed. Communication needs to be clear, and any questions that arise need to be answered.

Favoritism:
Once a manager has obvious favorites, he or she loses credibility and the respect of the rest of the team.

Just do it:
The Nike slogan does not work when employees are trying to gain an understanding of the process or project. Rather than expecting your team to simply work blindly on tasks they do not understand, a good manager takes the time to explain what the project is all about and how the team’s work is incorporated into the plan. Remember, the more the team is invested in a project, the better the results will be.