What is a manager responsible for?

There are 5 key things that a manager is responsible for

Planning, Controlling, Staffing, Organising and Directing.

A manager is someone who gets things done with people. So they will probably have people working for them, and will need to make sure that they are doing the right things (directing), know what they have to do (planning and organising) and have the right skills and numbers of people to do the job (staffing).