Best workflow/approach for dev teams on localhost

I’ve been a freelancer working solely on my own with all my EE installs on localhost on my Mac. Soon it looks like I’ll need to collaborate in my home office with another EE dev so am looking for suggestions as to the best workflow set-up.

Basically we’d both be working on the same EE dev site in the same office but on our individual laptops. What’s the best approach to facilitate this?