I would like to add extra sections like "gender" on the WordPress user database. I would like to draw information from this information later. For example, let's say I want to attract gender. I created custom registration pages using the "ultimate member" extensions for this, but nothing changed in the database. there is still information like "user name, nickname, e-mail, registration data" only.
You can find any additional information in the usermeta table as meta_key meta_value pairs. Wordpress doesn't create additional database columns for custom fields. That's one of the great concepts that make Wordpress so smart and flexible.