How to make a game multiplayer?

Just wondering what steps I need to take to allow another player to join a game. Or multiple other players.

i am on that path as well and will be doing deep exploration of the multiplayer game example included with the engine.

i think you have to build a dedicated server https://docs.aws.amazon.com/lumberyard/latest/userguide/sample-project-multiplayer-enhanced.html#sample-project-multiplayer-enhanced-creating-a-dedicated-server

to test: https://github.com/awsdocs/amazon-lumberyard-user-guide/blob/master/doc_source/linux-test-windows-client-linux-server-connection.md