With it you work for someone or whether you work for yourself no matter what you do there are projects to manage. For instance, if you have your own business, you need to lay out a plan for each step you are going to do. Such as, what if you are publishing a book: what steps will you take to complete the book? What steps will you take to promote the book? Where will you sell the book?
V.'s are three different projects do that you need to lay out different steps that you will take to first write the book, then to promote the book, and finally to make sales. If you are unfamiliar with managing a project then you need to learn how to do this. Because, whether you are in business for yourself or whether you work for a company, you will be assigned to work on a team to either manage a project, or help put the project together.
With Project Management PrepCast you can learn online what you need to do to manage a project. This way he gives you more leverage in getting a job with a company like saying that you have the experience and the certification, plus, when you put a team together to manage projects that you were working on for yourself it gives you a good overview of managing your own projects.