At the top left of documentation pages you can switch engine versions. The 4.27 docs take you to the UE4 listing and the 5.0+ docs take you to the UE5 listing.
Renting virtual machines and GPUs can get pricey. It’s worth noting that the default machine instance being used is a G5 which is pretty powerful. You can also launch with a G4 instance at a much lower price and still get reasonable performance. Also, you can turn on and off your virtual machines whenever you like just as you would with a regular PC. Persistent storage will still cost you, but compared to the on-demand VM it is very little.
Anyways, if you have Unreal Engine installed and running in a virtual machine on the cloud, you won’t need port 7777 to use the editor. You will need a port open for remote desktop. And if you shut off all other access to the internet you won’t have access to Launcher / marketplace features, Quixel, pixel streaming, etc. Using our cloud marketplace offerings will get you started easily.