What happens to my site when I delete a space connected to it?

The deleted space will be removed from the site.

The site, along with all its custom settings, will remain accessible for linking with different space(s).

Single space connected to a site

If your site is connected to single space, when this space is deleted it will remain in the trash for 7 days until it's deleted entirely and the content is no longer recoverable.

Multi-variant space connected to a site

If you delete a space connected to a site, all other variants will remain available. You might need to check if your default space (the one visitors will land on) is set correctly.