How should code changes be managed and pushed through environments?

There are many ways to manage and push code changes to environments. You can use localhost + GitHub + BuddyWorks as we did in UPQODE:

• install WordPress locally with all needed plugins and theme. 
• install Gulp with npm (Node package manager) for generate minimize versions of  js and css files. 
• push changes on GitHub (at first on dev branch and then checked version on prod branch).
• BuddyWorks watching changes on GitHub and moved them to server side.