gui projects what a player has said in chat?

I know you said article but I'm here to give you a script.

A SurfaceGui or a ScreenGui? I'm going to assume you mean SurfaceGui.

So to start off: Make a Script in ServerScriptService.

Script:

game.Players.PlayerAdded:Connect(function(plr) -- when a player joins
    plr.Chatted:Connect(function(msg) 
        workspace.PartName.SurfaceGuiName.TextLabelName.Text = plr.Name..": "..msg
        -- Replace PartName with your part's name, SurfaceGuiName with your surface gui's name, and TextLabelName with the name of your text label.
    end)
end)

Not too hard, yet suprisingly cool.