How to install and use Git with OLS 1 Click Wordpress Droplet?

#1
Hi, I have installed OLS 1 Click Wordpress Droplet on DigitalOcean and Everythig is Working Perfectly!:) I just want to know that How can I use Git with Wordpress and OLS so that when I make changes locally and push it to my Server, it would be Live. I also want your suggestion in this case as that is it a Secure Method or How could I secure it, as I have never used git on Server before However I have hosted Sites on Github Pages.
Thanks in Advance.
 
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