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In order to sync your local project on your computer to GitLab you will need to install and setup a Git client such as SourceTree or GitKraken.
For a list of Git clients that are compatible with GitLab : see the following websites.

• https://about.gitlab.com/applications/#gui-git-clients
• https://git-scm.com/downloads/guis

Alternately, if you prefer using Git via the command line, you can find helpful documentation here: https://gitlab.blinkm.io/help/gitlab-basics/start-using-git.md 

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