advancedcustomfields plugin would help you take full control of your WordPress edit screens & custom field data.
If your site post/page/user need add some customed fields,this plugin was convenient to help you.the following video shows how to add customed fields to your posts and pages.
In the above video,i add fields age and phone to Profile page,
add vocals and guitars field to some Band post.
if you will publish many posts and pages,you can specify custom fields value for each.