Knowing what you have got is to know what skills you have, what interests, motivations and goals, dreams, ambitions and qualities you have.
What are your skills? Know what you can do, what things are you capable of doing?
What drives you? What will make you do your best? How can you do it? What can make you shine? What drives you to give your best?
What do you aim for life? These are your dreams, ambitions, what you would like to do and what do want to achieve in life.
What kind of career best suits you?
Know your total package!
Knowing what qualities you have, what you can do and what you want to achieve will be a good way of knowing yourself even more so you can market yourself more when applying for a job. Job interviews almost always ask for what you can do when hired for the job, therefore, you are supposed to know what to answer these questions should they arise during your job applications.