Many people prefer using the keyboard to a mouse, which is why Windows includes keyboard shortcuts. These keyboard shortcuts let you perform tasks using the keyboard instead of the mouse.
For example, if you want to browse tasks on the taskbar, press the Windows + T keystrokes. This will move the focus to the left-most icon on the taskbar. You can then use the arrow keys to move to other taskbar icons. In addition, as you move through the icons, you will also get a live preview of each window.