Wordpress Developer Support

Answer: Because you want to make changes to your favourite theme and not lose them next time the theme is updated.
How?
1. Create a folder in /wp-content/themes/ – I usually name it after the parent theme but add the word Child on the end. For example if the theme is called “AussieBlue” then I create a folder called “AussieBlueChild”....

See: http://wordpress.tv/2012/12/07/jayvie-canono-building-a-career-with-wordpress/http://wordpress.tv/2012/12/07/jayvie-canono-building-a-career-with-wordpress/
 
 

If you look at an existing these you’ll notice that there are about 12 core files. Some themes come with more files to allow for more customisation. Here’s an overview of the main files you’ll need to know about.
header.php -  Contains everything you’d want to appear at the top of your site.index.php – The core file that loads your theme, also acts as the homepage (unless you set your blog to display a static page).sidebar.php – Contains...

Various meta tags can be used allowing you to embed more information about the content in your pages than the user will see rendered on the page. This (depending on who you believe) is also useful in getting the correct search engine ranking for your...