In one sentence, describe what the following article is about:

Open the Apple menu {"smallUrl":"https:\/\/www.wikihow.com\/images\/f\/ff\/Macapple1.png","bigUrl":"\/images\/thumb\/f\/ff\/Macapple1.png\/29px-Macapple1.png","smallWidth":460,"smallHeight":476,"bigWidth":"29","bigHeight":"30","licensing":"<div class=\"mw-parser-output\"><p>I edited this screenshot of a Mac icon.\n<\/p><p>License: <a rel=\"nofollow\" class=\"external text\" href=\"http:\/\/en.wikipedia.org\/wiki\/Fair_use\">Fair Use<\/a><br>\n<\/p><\/div>"}, click Restart..., and click Restart when prompted. Most of the time, this will be enough to get your computer out of Safe Mode. If your computer restarts into Safe Mode, proceed to the next step. Holding the ⇧ Shift key while restarting your Mac will cause the Mac to start in Safe Mode. If this key is stuck, you won't be able to restart your Mac without it opening to Safe Mode. If the ⇧ Shift key is stuck, remove it and then restart your Mac. If it still opens to Safe Mode, continue to the next step. Open the Apple menu {"smallUrl":"https:\/\/www.wikihow.com\/images\/f\/ff\/Macapple1.png","bigUrl":"\/images\/thumb\/f\/ff\/Macapple1.png\/29px-Macapple1.png","smallWidth":460,"smallHeight":476,"bigWidth":"29","bigHeight":"30","licensing":"<div class=\"mw-parser-output\"><p>I edited this screenshot of a Mac icon.\n<\/p><p>License: <a rel=\"nofollow\" class=\"external text\" href=\"http:\/\/en.wikipedia.org\/wiki\/Fair_use\">Fair Use<\/a><br>\n<\/p><\/div>"}, click Shut Down..., and click Shut Down when prompted. Press your Mac's "Power" button. It should be somewhere on the keyboard (laptop) or on the monitor (iMac). Do this directly after pressing your Mac's "Power" button. This will take around 20 seconds. Your Mac will appear to start during this time. If your Mac doesn't make startup sounds, just wait for the Apple logo to appear for the second time. This whole process resets the Mac's temporary system settings. Once your Mac is fully turned on, it should be back in normal mode. If your Mac still isn't rebooting into normal mode, you may have to take it into a tech department to have it checked out.

Summary:
Restart your Mac. Make sure that your Mac's ⇧ Shift key isn't stuck. Shut down your Mac. Turn back on the Mac. Press and hold ⌥ Option+⌘ Command+P+R immediately. Hold the keys until your Mac makes a second startup sound. Wait for your Mac to finish restarting.