What is the correct way to maintain two different versions of the same project on github?

I must say am new to Git and Github, I apologize in advance for such a basic question. I created my very first PHP "larval package" project on GitHub. I made multiple commits and pushed them on GitHub using Git Bash.

Now my code is stable enough and in a production ready stage. How can I make it ready for everyone to download it?

Once, the first version is available for download, I like to make another version for development where I am going to be adding more feature for the next release.

I want to end up with at least stable version and another dev version. If someone reports a bug in my production version, I want to be able patch it and commit only to the version that is in production "so none of the new futures that is the dev will be included in the patch"

What is the best way to accommodate this? What commands do I use to create and easily maintain multiple versions of the same project where I can add new feature to one version and only patches to the other version?

via Chebli Mohamed