Skills
Things you do well
Knowing what you are genuinely good at is harder than it sounds, and more useful than almost anything else you can know about yourself.
Skills are the things you can actually do: the capabilities you have built through practice, study, and experience that allow you to produce results other people value. Some are technical and specific. Others are more general, ways of thinking, communicating, organizing, or relating to people, that cut across everything you do. Both kinds matter, and most people are better served by understanding their full repertoire than by only thinking about the technical ones.
One useful way to take stock of your skills is to look at where you are consistently effective, where you produce results without extraordinary effort, and where others regularly come to you. Another is to think about what you could teach someone else, which tends to reveal understanding that goes deeper than you might have realized.
It also helps to distinguish skills you have from skills you are known for. A skill you have but nobody associates with you is not yet fully working for you professionally. And a skill you are known for but have not really developed is a reputation you may struggle to sustain.