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This is something that I do all the time but I always get it wrong....

• Navigate to ~/.ssh/

• Run below command and follow the prompt

ssh-keygen -t rsa

• Make sure the permission are as follow
  • .ssh directory is 700 (drwx------)
  • public key is 644 (-rw-r--r--)
  • private key is 600 (-rw-------)

NOTE: if you are using git-bash on windows and chmod doesnt work, then read this and install cygwin to chmod

NOTE NOTE: Host * should always be the last entry since the first obtained value for each parameter is used

• Create config file in ~/.ssh/ . A sample config should look something like this:

Host *
  User user123
  IdentityFile ~/.ssh/id_rsa