Time is precious. The quicker you can get menial tasks completed allows for more time on more important tasks. Learning keyboard shortcuts, like ctrl + c or command + c to copy, keeps your fingers on the keyboard instead of moving them to the mouse or trackpad and can help save time.
Most shortcuts involve the command (⌘) key on a Macintosh computer or the control (ctrl) key on a PC.
Listed below are some of the most frequently used keyboard shortcuts (Source: Lifehacker.com with permission).
For a complete list of Macintosh keyboard shortcuts, click here.
For a complete list of Windows keyboard shortcuts, click here.