How to disable a particular part in the source code of CSS?

Sometimes you want to disable a part of the CSS code without deleting it. To do so you can put "/*" and "*/" around the code you want to disable. You can use the same method to add headings and comments to your CSS files.

Step 1: 
Disable CSS code
How to disable CSS code
Step 2: 
Add headings or comments
How to add headings or comments to CSS file
Taxonomy: 

Drupal themes to be compared