Lost/deleated home page – how do I get it back?

I’ve been trying to sort the pages on my site and seem to have lost the front page/home page that was originally where my site went when I logged on to wordpress or my site. I now cannot seem to do anything with my site, I tried deleting other pages to try to resolve it (I’ve got stuff backed up so it’s okay) and am wondering if I’ve deleted a page I should not have done? I had two home pages at one time?

I now get “Not Found” when I go to my site.

Can anyone help me figure out what I’ve done wrong? I’m kind of new to wordpress (yeah big surprise there!) and still trying to find my way around!