there are tons of reviews to compare the editors. notepad++ is very good for windows enviroment. Atom is good, especially for markdown preview to keep the same format as the final show on github. However, Atom is pretty slow.

sublime text is light, and fast. This is a notes about how to install packages in sublime text 3.

1. go to Preferences then Browse Packages menu, it will open a folder

2. browse (up) to the folder called Installed Packages folder

3. Download Package Control.sublime-package and copy to the Installed Packages folder

4. restart sublime text

Example of install markdown text review package

1. go to Preferences then Browse Packages menu, it will open a folder

2. browse (up) to the folder called Installed Packages folder

3. Download zip package rename it to Markdown Preview.sublime-package (no .zip) and copy it into the Installed Packages/ directory

4. restart sublime text

When working on a Markdown file, type alt+m to generate an HTML preview of your document that will open in your default browser. (You can also call the Markdown Preview command using the Command Palette. You hit control+shift+p to call up the Command Palette, then type "Preview", select "Markdown Preview: Python Markdown: Preview in Browser", and hit enter.)