How many test domains can I create?

You can create as many test domains as you like. 

All your changes on test domains are only seen by you, until you press the "synchronize" button at the top of the page. 

Feel free to try out your perfect landing page and create exactly the travel website, you need.

If a page is live, you always have the option to change the status to integration test again, so you can try out in a safe area.