Let's start with a bird's eye view of Photoshop.
You'll see that its basic structure is actually quite simple and straight-forward. At the top you have your obligatory _menus_ and the big space in the middle is your file window or canvas.
To the left is your tool palette and right above it are the tool options, which differ depending on the tool you have currently selected.
To the right you have a customizable set of windows and tabs for quick access to all of Photoshops functionality.