The essence of the question is that according to many instructions for organizing a DNS server and a web server, bind9 should be installed, then Apache, nginx and the rest, I first installed Apache, etc., and then I remembered that I need to register the DNS, which means install bind9 . If you do this after installing apache, will everything work or will you need to delete Apache and install it in the order specified by the manuals? If you delete, then tell what commands. I am very beginner, so please focus on the elementary things that are usually silent because of their obviousness. Tk complex and so everywhere you can find.