Questions on multi-site

Hi there!

I’d like to create a pro website with two sub-domains.

Do I have to create a multi-site for the pro website or create three sites individually? How to create a multi-sites (on Local and for Wordpress)?

Can someone explain me simply (I’m french) what are blueprints for?
And do I have to activate Xdebug IntelliJ Integration?

Thank you very much.:grinning: