How do I build a new web site whilst keeping the existing site live then how do I change it over to the new site once completed. I'm using elementor and astra. Is there any video tutorials of this process.
What you can do is build the website in a staging area or on your local computer. Then create a migration package perhaps using all-in-one migration, and then you can overwrite the existing website with that. That's assuming the existing website is a WordPress based website.
There are many approaches to fabricate construct another wordpress site while the old site is live, however this is the most effortless non-specialized approach to do it.
1. Introduce another wordpress website.
2. Re-point your space name.
3. Change your wordpress site to have the right space name.