Kadence - How to Edit Pages and Add Your Own Content
Kadence child themes use the block editor to build the pages. The videos below will teach you how to edit the blocks and replace the demo content with your own.
If you're new to WordPress and/or the block editor, I really recommend just playing around with the blocks and pages to familiarize yourself!
A quick tutorial:
This video tutorial goes a bit more in-depth on editing pages: