How do I rotate a Model using CFrame?

I've just begun experimenting with CFrames today and it's been giving me a headache. I've been making plenty of desperate attempts on finding a way to rotate an entire model, and CFrame seems to be the one that is the most popular/mentioned so I went and give it a shot.

Here's my code if you're wondering what I've been up to. Note: The "????" is the part where I don't know what to put to rotate the model.

------- Code begins here -------

local model = game.Workspace:WaitForChild('Model') local modelgetchildren = model:GetChildren() local mouse = game.Players.LocalPlayer:GetMouse()

model.PrimaryPart = model:FindFirstChild('Part') mouse.TargetFilter = model

mouse.Move:connect(function() model:MoveTo(mouse.Hit.p) end)

mouse.KeyDown:connect(function(key) if key == 'r' then model:SetPrimaryPartCFrame(????) end end)

------- Code ends here -------

Thank you for reading this question and I hope you will spare some time to help me with this obnoxious (but important as it is a crucial element for my game) task!

P.S. This is my first 10 minutes into the community! Hi guys! :-)