How to Create a Page in Magento 2 Admin?

I not found this in github, where I can downlaod source code?

Please make video on .phtml file ----> clear doubts how to write the code for ko.js ----> take as an example wishlist core module. It's a request.
Well your videos made the concepts easy to understand.
I will be happy if u make playlist for ko.js and Magento 2 specific thanks

You make it looks so easy.