Access to the new editor
Go to control-panel and click on pages
In the list click on the 3 dots and choose new page editor

The basics
This video goes over the basic features and the user interface like:
Adding a section,
Switching between the different editor modes
Content width vs background width
Duplicate and move content
Save your progress.
tip: play video in 1.25 speed and use the timestamps in the video description
https://youtu.be/vI9Hqc4tToA