How do i get the targeted player to teleport to me?

There are a couple errors in each script that I can point out and fix for you.

Here's what your local script should look like:

local player = game.Players.LocalPlayer
local remoteEvent = game.ReplicatedStorage:WaitForChild("playertp")

player.Chatted:Connect(function(msg)
    if msg:lower():match("goto") then
		local targetPlayer = game.Players:FindFirstChild(msg:sub(6))
		
		if targetPlayer and targetPlayer.Character then
		--Checks if the player and character is there
		
			player.Character.HumanoidRootPart.CFrame =  CFrame.new(target.Head.Position)
	    end
    elseif msg:lower():match("get") then
    
	    local targetPlayer = game.Players:FindFirstChild(msg:sub(5))
	    --should be :sub(5) instead of :sub(6)

		   if targetPlayer and targetPlayer.Character then
		   
			   remoteEvent:FireServer(targetPlayer.Character)
			  --When firing, only fire the parameters, not the player

		   end
     end
end)

I made some edits so that the Chatted function isn't repeated twice. I also used a conditional statement to check whether or not the target is in the game, and whether his/her character is loaded.

Something to keep in mind is when you are firing a remote event to the server, you do NOT include player as a parameter. The server automatically receives it.

Here's what the server script should look like:

local remoteEvent = game.ReplicatedStorage:WaitForChild("playertp")

remoteEvent.OnServerEvent:Connect(function(player, target)

    target.HumanoidRootPart.CFrame = CFrame.new(player.Character.Head.Position)
    --You forgot to address the Character of the player

end)

Notice how the server automatically picks up who fired the remote event. It's the very first thing that it picks up in every :FireServer() case.

I hope this answers your question, let me know if you need any more details :)