Painter has three menus: File, Draw, and Effects. As you'd expect, the File menu is used to create a new image, load an existing image, and save an image; here are the items in the File menu:
The Draw and Effects menus work together; you select a drawing tool from the Draw menu (such as the line-drawing tool), and you can also select various effects from the Effects menu (such as drop shadows, texture fill, and so on). The items you select in these menus will have a check mark displayed in front of them, and they will stay checked until you select another item that is incompatible (such as selecting the ellipse-drawing tool). Here are the items in the Draw menu:
Draw rounded ...