In post I see next : “Disable these demo widgets by adding your own widgets or from Customizer > Layout Options > Miscellaneous > Disable demo widgets.”
I like this demo widgets/
How can I disables this message whitout Disable demo widgets ?
You can find a list of section here: http://demo.acosmin.com/themes/justwrite/ > Theme Features > Sections
A list of normal widgets you can find in your WP Administration Panel > Appearance > Widgets (all the widgets that have AC: as a prefix).