How do I set up a work environment for both Mac and Windows?

I was wondering, how do I set up an environment for both Mac and Windows? I have a Mac laptop I develop in and then a Windows machine at home. I'd love to be able to develop between both. For the most part I write web application written using create-react-app and rails. I've noticed that whenever I push my work to GitHub, it doesn't work on the other environment, maybe because they may have different dependencies. Any tips or tutorials that you could link me too would be greatly appreciate it!