How to change background and text colors in Sublime Text 3

Question

My questions are:

• How do I change the overall colors (background and font)?
• How do I change the colors based on the file type that is open?

Answer 1

This question -- Why do Sublime Text 3 Themes not affect the sidebar? -- helped me out.

The steps I followed:

1. Preferences
2. Browse Packages...
3. Go into the User folder (equivalent to going to %AppData%\Sublime Text 3\Packages\User)
4. Make a new text file in this folder called Default.sublime-theme
5. Add JSON styles here -- for a template, check out https://gist.github.com/MrDrews/5434948