Re: about work adword
Yes, AdWords is a very complicated program with hundreds (maybe thousands) of combination options. It can take months (years) to become really "good at it."
In general, most people begin working with AdWords because they are business owners who are advertising their own products/services. Others get a job handling a company's advertising account or they go to work for an agency that has multiple client accounts.
If you are starting on your own, I would advise that the first thing you should do is to go to the learning center and study all of the materials. Pay for and take the tests to become certified. (You'll also need to have actual experience managing one or more accounts.)
If this does not answer your question, please feel free to post again!
Google AdWords Top Contributor