1. Double click on upper left corner to close any window (windows os) ;)

Note: Try this on different window as it will close your browser!

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2. Increase/Decrease the speed of process in your computer

• Start Task Manager. (win+r -> taskmgr)
• Switch to details tab.
• Right click on any process that you want to speed up and change its priority according to your need. 
  
• And after you are done, remember to reset the priority to initial/default value as it can affect the normal processing of the system.

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3.  Here is how to download Instagram images or any other:

• View the image
• Press ctrl+shift+i or right click on image and select Inspect Element.
• Copy address of the image and open.
  
  
  
• Voila, with the original sized image.

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4. Google search within  "   " to get exactly what you want.
  Eg: "half blood prince"

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5. Reset Ubuntu Administrator password:

• Reboot into recovery mode.

• Select the root option
  

• Type this: mount -rw -o remount /

       This remounts the root "/".

• root@ubuntu:~# passwd Administrator

       Enter new UNIX password: "Enter the desired password"
       Retype new UNIX password:
       passwd:  "Re-enter"    password updated successfully        
       root@ubuntu:~#

• Resume the normal boot and login with the new password that you just created.

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6.  Open command prompt of any location without changing directory. 
     Clear the address and type cmd in the file explorer address bar.

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7. Open a notepad and paste this code to make a utility software in windows that speaks whatever you type in it. Save it as anyname.vbs

Dim message, sapi
message=InputBox("Enter text to speak!!","ATT Text To Speak")
Set sapi=CreateObject("sapi.spvoice")
sapi.Speak message

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8. Press ctrl + alt + any arrow to change the orientation of the screen.

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Source:Quora(Sumit Kumar).

Print a book of selected Wikipedia articles.  

1. Go to the Wikipedia main page and click on the "Create a book" link in the left sidebar. 
   Wikipedia, the free encyclopedia
   
2. Click on "Start Book Creator".
   
3. After that, you will get the following section on any wiki page you visit.
   
4. Just visit the Wikipedia pages you want to collate as a book and keep clicking on the "Add this page to your book" link.
5. After you are done adding, click on "Show Book".
   You will reach the following page where you can customize the book - add chapters. reorder the articles etc. 
6. Download the book in any format you like using the link at the right-bottom.
   
7. Enjoy. And thank Mr. Jimmy Wales and his team (Mr. Tom Morrisand others).

This feature can be used to read offline about topics with multiple Wiki articles.

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Edit:
Here's where you can find all user-created and curated books :Category:Wikipedia books (user books)

Here's a list of books Deepak Mehta  have created:

1. User:Draconiand3v1l/Books/The Best of Wikipedia
2. User:Draconiand3v1l/Books/1CreepyWiki
3. User:Draconiand3v1l/Books/1Lists
4. User:Draconiand3v1l/Books/Batman                                                                                                      Source:Quora(Deepak Mehta).

1. Stolen Camera Finder - Use Photo EXIF Data to Find Your Stolen Camera
Via stolencamerafinder.com

2. Type Like a TV Hacker
Via hackertyper.com

3. The World Data Counter - Ever Wonder Exactly How Big the Internet Is? Or How Much Data is being Transferred at any Time? This Website Will Help You.
Via mapr.com
The World Data Counter.

4. MSOutlookit - A Fake Web Browser for Work (In Case Your Boss Walks In)
Via msoutlookit.com

5. sleepyti.me - The Bedtime Calculator
Via sleepyti.me

6. The Pixar Theory Explained - Had Trouble Understanding the Written Version of the Pixar Theory? Here You Go.
Via pixartheory.com

7. Ninite - A List of Essential Software and Downloads
Via ninite.com

8. Flux - Changes Your Computer Screen with the Time of Day / Night for Less Strain on Your Eyes
Via justgetflux.com

9. RunPee - Find Out the Best Time During a Movie to Run and Pee
Via m.runpee.com

10. StudyBlue - Create Flash Cards to Study
Via studyblue.com

11. The Original SpaceJam Website
Via www2.warnerbros.com

12. Now I Know by Dan Lewis

Via nowiknow.com

13. Down For Everyone Or Just Me -> Check if your website is down or up? - Is the Website Down for Just You or Everyone?
Via downforeveryoneorjustme.com

14. EyeBleach - See Something Terrible on The Internet? Let a Sexy Man or Woman Wash Your Eyes
Via eyebleach.com

15. BIGASSMESSAGE - Ensure Your Friends Get the Message
Via bigassmessage.com

16. iRuler - The Internet Ruler
Via iruler.net

17. UnplugtheTV - Educate Yourself Without the Television
Via unplugthetv.com

18. Video > Start Cooking - For those Beginning Their Cooking Journey
Via startcooking.com

19. ListentoYoutube - Converts Youtube Videos to MP3s for Download
Via listentoyoutube.com

20. ZocDoc - So You Can Find a Doctor and Fast
Via zocdoc.com

21. LibriVox - Free Public Domain Audio Books
Via librivox.org

22. What the Font - Discover What that Font Is
Via myfonts.com

23. MIT Open Courses Online
Via ocw.mit.edu

24. Old versions of Windows, Mac and Linux Software, Apps & Abandonware Games - Download at OldVersion.com - Incase You Update Your Software and It Sucks
Via oldversion.com

25. SimplyNoise - Simply White Noise to Drown Out Everything Around
Via simplynoise.com

26. Rainymood - The Sound of Rain and Thunderstorms on your Computer
Via rainymood.com

27. Spreeder - A Speed Reading “Coaching” Application
Via spreeder.com

28. Scale of the Universe - Because It’s Just Amazing
Via htwins.net

29. Let Me Google that For You - For that Annoying Friend that Asks Stupid Questions Over the Internet
Via lmgtfy.com

30. WHERETHEFUCKSHOULDIGOFORDRINKS - For Friends that Can’t Make Up Their Minds About Where to Go Out
Via wherethefuckshouldigofordrinks.com

31. DrunkRonSwanson - Because We All Need More Drunk Ron Swanson
Via drunkronswanson.com

32. Ted - A Learning Site Your Won’t Regret Wasting Your Time At
Via ted.com

33. iDaft - Pretend You’re Daft Punk
Via najle.com

34. OMFGDOGS! - The Mere Fact that this Exists is Amazing
Via omfgdogs.com

35. Lizard Point - Brush Up on Your Geography
Via lizardpoint.com

36. Do I Have A Dead Pixel - Test to See If You Suffer from a Dead Pixel
Via doihaveadeadpixel.com

37. Readability - Makes Articles Easier to Read
Via lab.arc90.com

38. CamelCamelCamel - Amazon Price Tracker
Via camelcamelcamel.com

39. SAMUEL L. IPSUM - Samuel L. Jackson Text Generator and Placeholder
Via slipsum.com

40. Death By Caffeine - How Many Energy Drinks Until You Die?
Via energyfiend.com

41. WHATTHEFUCKSHOULDIMAKEFORDINNER - Incase You Can’t Figure Out What to Make for Dinner
Via whatthefuckshouldimakefordinner.com

42. Garfield Minus Garfield - Just Amazing
Via garfieldminusgarfield.net

43. Shit You CAN Afford - SkyMall for People on a Budget
Via shityoucanafford.com

Source:Quora(Vishal Gala)