The Tools window
Our first and most frequented stop is the Tools window, which opens by default attached to the left side of the screen. If not, just go to the Window drop-down menu at the top of the screen (this list enables you to turn any window on or off) and click Tools. Selecting a Tool icon will change the mode your cursor is in: Brush, Eraser, Shapes, Selections and so on. Right-click any of the icons to reveal extra options, click the double triangles at the top for two rows, and you can drag the bar off the frame if you prefer it to be free-floating.