How to split a site into development and production versions?

Question

Network administration

Hello.
Available: a site on Wordpress, which is put on the DigitalOcean server.
The task is to organize such a system when we have 2 versions of the site, the first - on the main domain (production), the second - on the technical (development). Actually, the most important question in the interaction of these versions: it is necessary that changes from those. versions were easily transferred to the main one.
I understand that I need to dig towards version control systems, but I don’t have much experience with them.
Also, a huge issue is the control of not only the file system, but also the mysql database.
Help, at least in which direction should I look

Answer 1

git + CI + db migrations