No. You click on text to change it, drag sections in from a list, and pick colours from a palette. If you can use a word processor, you can build your site.

Export it as a folder of files and put it on any hosting you like. While you build, a live preview at an address under this site lets you check every page on any device.

Yes. Upload them from your computer or phone and place them anywhere in your design.

Export your site as files before your plan ends: that copy is yours to keep and host anywhere. The editor closes when the plan ends and the preview address shows a notice a week later.

On plans that include export, one click gives you your whole site as ordinary web files you can host on any server.