I use Namecheap Marketplace to sell my domains. As i register my domains with them and i love to put the domains for sale with them. I don't like to use other sites (i use forums to sell my domains though)
If you really want to protect your site from DDos it is better to avoid shared hosting. Hosting company will claim they provide DDos support but it is not advisable. Going with VPS with DDos protection is a wise choice.
The new editor is not for all, the best thing is we can revert back to Classic editor by installing the plugin. Glad they kept the classic editor else it will be a disaster. I really don't like the new editor.