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Best Websites to Learn Programming in Free

  1. https://frontendmasters.com/
  2. https://www.class-central.com
  3. http://www.udacity.com
  4. http://www.freecodeamp.com
  5. https://codecademy.com
  6. https://mva.microsoft.com/
  7. https://github.com/open-source-society/computer-science
  8. https://www.khanacademy.org
  9. https://www.safaribooksonline.com/ ( One Month Free Trial )
  10. http://edx.org
  11. http://coursera.org
  12. http://udemy.com
  13. https://www.skillshare.com/
  14. https://thenewboston.com/videos.php
  15. https://angularfirebase.com/
  16. http://w3schools.com
  17. https://www.airpair.com/
  18. https://egghead.io
  19. http://tutsplus.com
  20. https://www.pluralsight.com/browse/software-development ( 10 Days Free Trial )
  21. https://hackr.io
  22. https://academy.fossbytes.com/
  23. https://www.codeschool.com
  24. http://www.learnvern.com/
  25. http://www.lynda.com (10 Days Free Trial)
  26. https://www.datacamp.com
  27. https://alison.com/
  28. http://programming-motherfucker.com/become.html
  29. https://itpro.tv/PAID

  30. https://www.cbtnuggets.com
  31. https://linuxacademy.comAWS (Amazon Web Services)
  32. https://www.youtube.com/watch?v=BDBvHOaaKHo&list=PLv2a_5pNAko0Mijc6mnv04xeOut443Wnk
  33. https://linuxacademy.com/ (AWS and other cloud solutions )
  34. https://coursehunters.net/
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Android: How to generate key hash for Android Facebook?

In order to generate key hash you need to follow some easy steps.

1) Download Openssl from: here.

2) Make a openssl folder in C drive

3) Extract Zip files into this openssl folder created in C Drive.

4) Copy the File debug.keystore from .android folder in my case (C:\Users\SYSTEM.android) and paste into JDK bin Folder in my case (C:\Program Files\Java\jdk1.6.0_05\bin)

5) Open command prompt and give the path of JDK Bin folder in my case (C:\Program Files\Java\jdk1.6.0_05\bin).

6) Copy the following code and hit enter

keytool -exportcert -alias androiddebugkey -keystore debug.keystore > c:\openssl\bin\debug.txt
7) Now you need to enter password, Password = android.

8) If you see in openssl Bin folder, you will get a file with the name of debug.txt

9) Now either you can restart command prompt or work with existing command prompt

10) get back to C drive and give the path of openssl Bin folder

11) copy the following code and paste

openssl sha1 -binary debug.txt > debug_sha.txt
12) you will get debug_sha.txt in openssl bin folder

13) Again copy following code and paste

openssl base64 -in debug_sha.txt > debug_base64.txt
14) you will get debug_base64.txt in openssl bin folder

15) open debug_base64.txt file Here is your Key hash.

Source: StackOverflow