You can add a nice looking author bio by going to the 'Users' section of WordPress and editing the post author.
Display Name
You can set your display name to be your first and last name entered.
Biographical Info
Enter some text within this field to display a short bio for the author.
Image
This automatically uses your gravatar.com profile image. if you'd like the option to use something else, try the WP User Avatar plugin.
Facebook and Twitter Links
These fields become available if you have the Yoast SEO plugin installed.