If you don’t want to execute git command with password, you can do the following:

  1. ssh-keygen -t rsa -b 4096 -C "[email protected]" -f ~/path/key1
  2. ssh-keygen -t rsa -b 4096 -C "[email protected]" -f ~/path/key2
  3. vi ~/.ssh/config 
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    # github.com
Host github.com
    HostName github.com
    User $username
    IdentityFile ~/path/key1

# gitlab.com
Host gitlab.com
    HostName gitlab.com
    User $username
    IdentityFile ~/path/key2
    Note: you can distinguish different repository with custom Host, then you should replace HostName with Host.
  4. if you configure it in windows, maybe you need to configure the ssh-agent 
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    $ eval "$(ssh-agent -s)"
$ ssh-add ~/path/key1
$ ssh-add ~/path/key2
$ ssh-add -l    # do this for ensure had add correctly

Now you can use git protocol without password. Just test as following:

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$ ssh -T [email protected]
$ ssh -T [email protected]