You can write simply about yourself, who are you, What have you done in your past, or anything which reflect something about yourself. The about us section helps us know the heterogeneity and potential the following user is carrying. The about us page is often a reflection of the purpose and personality of the user.
Finally, the page can also combine contact or locational information. One way to view the about us concept is as a text self-portrait or short autobiography created by the users for the company. Therefore it is the required field.