How do I make a model spin or rotate around a certain point?

I have always wondered how this works. I need help. It will be important for a game I am currently developing. Can somebody show me how?

Basically, when you go into the ROBLOX studio, in the top right, there is a picture of a mountain with a green plus sign. Directly to the left there are two arrows; click these and then a drop-down will appear. The tool farthest to the right is the motor tool which looks like a grey block with a yellow pin on top. Click on the motor tool. Now when you click on the side of a brick it will put a motor on the side of the brick you selected. Now you can put another brick next to the motor and when you click the play button you can see that it will have worked and your brick will be moving.