In the Layout folder you can find different page layouts from within the Page Editor.
You can insert a layout directly into the text you are writing in the Page Editor.
Open and select layout from the /templates/layouts/ folder in the Page Editor
Layouts

Bootstrap Thumbnail Galleries
Images in galleries are stored in /theme folder.
Lorem Ipsum Bacon
Lorem text for showing text area.
Youtube video
An example of how to enbed a Youtube video.