how to work with more than one user and more than one key

how_to_work_with_more_than_one_user_and_more_than_one_key.txt

To be able to utilize more than one key in your github environment on one computer, and assuming we have the 2 following keys:
~/.ssh/id_rsa_personal_key
~/.ssh/id_rsa_company_key

Create the file ~/.ssh/config with the follwoing content:

### Default (Personal) GitHub
Host github.com
  HostName github.com
  User git
  IdentityFile ~/.ssh/id_rsa_personal_key

### Company GitHub
Host company-github
  HostName github.com
  User git
  IdentityFile ~/.ssh/id_rsa_company_key
  
Make sure all the keys added:
$ ssh-add -l ### this should list the keys added
$ ssh-add /path/to/your/key ### to add a key

Also, to be able to track your user contributions separately, make sure you are working with the correct github user:
$ git config user.email  ### to list the email of the current user

$ git config --global user.name "USERNAME-HERE" && git config --global user.email USER-EMAIL-HERE ### to update the current working username & email