https for a webapp port 443?

In my Build Settings / Shared the build port has a pull down for port 443
Does that imply that to connect you must use or
Is there a wiki on setting up server certificates etc?

Look in the WebApplication docs.

If you are hosting your WebApp with AWS, Https 2.0 can be setup with a load balancer. Https 2.0 is dramatically faster then 1.1 particularly over high latency networks.

Other service providers may be able to do the same. For AWS the flow looks something like this.
WebApp > -http:80- > Load balancer > -https:443- > Browser