How do I program a multiplayer gameplay server?

How do I program a multiplayer gameplay server?
I made a game, but I don’t know how to make it possible to play online with multiple players
Is there an explanation on YouTube?

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If it can help you @Luckythespacecat and @VegeTato made some templates for multiplayer games https://luckythespacecat.itch.io/roshambo-royale
https://vegetato.itch.io/online-multiplayer-template
I tag them in case you have some questions to do to them