Course 2 : (Comments and Variables ) when you create a script or page that will be used by you and other people you should always add comments to explain your steps you did take while programing that script or just to explain what this script does(sometimes you download scripts without any idea what it does so comments help alot ) keep in mind that you can see comment only if you open the php file in a text editor(you can't see it on the website or with view source) now there are 3 ways to comment in PHP here full lesson and codes