Prerequisites:

1. Download git-scm
2. GitLab server
3. Open the C:/user/your-user/.ssh/ and create the SSH key via git-bash:

   >> ssh-keygen.exe -t rsa -b 4096

4. Add the public key to your GitLab account
   4.1 Enter your GitLab website
   4.2 Click on your profile, then ‘Setting’ and after that select ‘SSH-Keys’
   4.3 Follow the instructions of GitLab for adding a new key
5. Create a ‘config‘ file (without extension) in C:/user/your-user/.ssh/ and add the following content:

   Host sample_1
       user git
       hostname git.domain.com
       port 22
       identityfile ~/.ssh/generated-private-key-file_1
   
   # For multiple ssh-key you can add more than one host
   Host sample_2
       user git
       hostname git.domain.com
       port 22
       identityfile ~/.ssh/generated-private-key-file_2

6. Test it with the git-bash console:

   git clone git@sample:project.git

7. [Optional] If the key could not be found try to add the following argument to your environment variables:

   Name:  HOME
   Value: %USERPROFILE%