I don't want to demean anybody's hard work, but I can't even understand what this site is attempting to do. Is it some kind of website builder? Do you have any good examples of what this thing can do?
Yes, it is some kind of website builder, but a bit more technical. To be precise, it is a frontend editor. Like glitch, jsfiddle or codepen. Try to play around to get a feel for it. Let us know if there's something specific you don't understand,
we can help you out.