Checklist
The System Web Server does not use ports 80 nor 443.
The Web Center does not use ports 80 nor 443.
Optionally, the Configuration shared folder has been created. Otherwise, you are OK with the fact it will be created automatically.
You have a method, such as SSH, SMB, AFP, NFS, or File Explorer, that enables you to create or modify files in the Configuration folder.
You have a method to add DNS aliases (CNAME), or will be installing Pi-hole to administer CNAMEs.
You have selected a domain, or a subdomain, to use for the local network. Throughout the documentation, the example.com domain will be used.
You have decided on what SSL certificates you wish to use.