How do you think is it necessary to study to become a manager or it is better to obtain other profession and then if you dominate it you can become a manager without studying

What does content manager do? What is his work?

Administrators are integral to the success of any company. Not everyone, who qualifies as a manager, is employed in this position after leaving school. Employers tend to require prior working experience. Instead, they are hire individuals as entry-level supervisors and then elevate them to higher management positions. There are three different ways graduates enter into management positions.
i.    After completing departmental training such as sales or marketing.
ii.    Also, by working in an administrative function and working up the ladder.
iii.    As well as applying in the final year through a training program at the graduate level.
There are various management qualifications. They include and are not limited to: Masters of Business (MBA), Bachelors degree, Diploma in Management, Professional Qualification, Post graduate degree, Executive diploma in management, many years of working experience at a particular company or extensive knowledge on various business processes.