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Jan 10, 2013 •
If you're customizing a WordPress theme, it's best to create a child theme out of the WordPress theme. With a child theme, you can update the parent theme when updates are available. Any customizations you make to the child theme will be retained.
Here's how it works.
Description: Child theme for the twentytwelve theme
Author: Your name here
When the parent theme gets updated, just apply the update to the parent folder and your child theme's customizations will remain in tact.
Here's a video showing the process:
See the Child Themes page on the WordPress Codex for more information.