FIG.1 is a picture showing the most common set up for the transformer, controller, and components. Your transformer may look a little different and is probably mounted outside, in the garage, or in your basement. No matter where it is mounted, it will have a similar set up utilizing a nearby outlet, (usually with a GFI reset), and some form of controller/timer.
In addition to FIG.1, you will see four pictures below showing each of the four most common types of timers/controllers in our systems. Wi/Fi, Bluetooth, and two different models of Intermatic astronomic timers. Click on the thumbnail most resembling your system for more details on your controller.