Joomla templates mainly involve index.php , few images and one important css file.  The file is called "template_css.css"  .  These are core files for any joomla template.

 However, it is not necessary to keep a file called template_css.css for a css file.  You can set any name to it.  You can use any editor to create css.  Or you can use joomla core editor to edit the css file.

 CSS files are basically nothing but text files.  So, you can use your notepad if you use windows.  We generally use notepad++ which is very good and compatible for linux servers.  Technically there are few differences between linux and windows text files.

 But not to worry, you can still use notepad for windows to edit the template_css.css file.

Ok, suppose if you want to modularize the css ,is that possible?  Yes it is.   template_css.css files consist of classes that is used to beautify things on the tags like contentheading , h3 , h2 , bold , small etc.  As well, the same file contains DIV related classes to set the layout engine.

 To, simplify or (i can say it is lazy too) or less to confusion, we separate css files.  For example, we use mainmenu.css for menu definititions.  user3 for top menu definitions.  layout.css for layout engine.  This is very useful if someone want to touch only the top menu or main menu.

I hope you like this post,