Article: You can use your Mac's arrow keys and the ⏎ Return key to move the cursor's selection around the currently open window, but you can also use the following shortcuts to perform a few more complex tasks:   ⌘ Command+Q — Quit an app (or currently open window).  ⌘ Command+Space — Open the Spotlight search bar in the middle of the screen.  ⌘ Command+Tab ↹ — Switch to the next window.  ⌘ Command+N — Opens a new Finder window if you're on the desktop.  Alt+F2, then ⌘ Command+L — Opens System Preferences.  Ctrl+F2 — Select the Apple Menu (pressing ⏎ Return will open it). Depending on your Mac model, use one of the following keyboard shortcuts to do this:   MacBook with Touch Bar — Quickly tap the Touch ID button three times.  MacBook without Touch Bar — Press Fn+⌥ Option+⌘ Command+F5 at the same time.  iMac (desktop Mac) — Press ⌥ Option+⌘ Command+F5 at the same time. Tap the Touch ID button three times (MacBook with Touch Bar) or press ⌘ Command+⌥ Option+F5 (all other Macs) to do so. You can also use the ↓ arrow key to select the "Enable Mouse Keys" box and then press the ⏎ Return (or Spacebar on some computers) key to check it. This will allow you to disable Mouse Keys by using the keyboard shortcut that you used to enable Mouse Keys. Unfortunately, you can't type with Mouse Keys enabled. Using the U, 8, O, and K keys, you can move the cursor left, up, right, or down, respectively. Pressing the J, 7, 9, or L keys will move the cursor at a 45° angle down to the left, up to the left, up to the right, or down to the right, respectively. The 5 key is essentially the left-click button when you're using Mouse Keys. You can also hold down Control while tapping 5 to simulate a right-click. Maneuvering the pointer to rest over an icon and then pressing the M key will simulate a "hold" action, allowing you to drag the icon beneath your mouse pointer by using the movement keys.  This is also helpful when attempting to activate hold-sensitive menus, such as the Trash menu. You can press . to release the hold.
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Try using basic keyboard shortcuts. Open the Accessibility Options window. Enable Mouse Keys. Leave the Accessibility Options window open. Move your mouse cursor around. Click with the 5 key. Hold down the mouse.