Personal expertise can refer to both professional ability and skills related to interests outside the major, which may have nothing to do with the direct work content or have little to do with it.
Personal expertise is generally filled in the resume or registration form of various activities, and you can choose the appropriate expertise to fill in according to the work and activities you want to sign up for.
Personal strengths can also write some personality characteristics, such as carefulness, boldness, hard work and so on, which will leave a good impression on people.