Why is it comparatively easy to answer the above questions, but less easy to answer it ourselves? We know what we're not good at; that's an easy one to answer. So, how do we find out what we are good at and why is it important?
If you know what your best friend is good at, might they know what you are good at? Who else might know what you are good at? There must be a reason why people come and speak to you when they have a particular problem.
Are you a good listener, a good problem solver, someone who will speak up for you? In the last project you did why did your boss ask you to do a particular task?
In reality, everyone you know already knows what you are good at. And you can be different things to different people. If you prefer not to ask them directly, the next time they ask for your help, consider why. Why you and not someone else?
So, why is knowing what you are good at important? Consider your next career move; you could market yourself as having an extensive skill set or you could market the fact that you are good at what you do.
Remember the advert 'It does exactly what it says on the tin', what does it say on your tin?
What needs does your future employer have and why should they choose brand 'you'?