Sure, it may seem that a lot of managers do nothing and are mostly there to make life harder for everyone, but, actually, this is not true.
As a manager it is your job to create an environment where people can meet their potential. Therefore improve their performance.
In order to be a successful manager you need to:
-Set and measure goals
-Make quick and hard decisions
-Improve the workflow
Test out your management skills at weekdone.com/manager-simulator/