How to manage text / data in a PANEL PAGE

My page layout has few columns and I want to use PANELS.

Can someone explain how easy it is to manage (ADD/EDIT) data in different sections of a panel page?

I tried but seems we can only render data by using blocks or views in panel and can not directly add text etc.

Would prefer to use WYSIWYG editor for easy text/images display.

Thanks a lot.

Drupal version: