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WordPress 3.7 Complete Third Edition by Aaron Hodge Silver, Karol Król

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Some not-design-related theme basics

For you to be better informed while choosing and installing themes, let's have a quick look at some factors to consider, and what actually makes a theme.

The structure of a theme

A WordPress theme is actually a collection of files in a folder. There are no special or unusual formats, just a few requirements for those files in the theme folder. The only requirements for a folder to be a valid WordPress theme are as follows:

  • It should have a style.css file and an index.php file
  • The style.css file must have the basic theme information in its first five lines

There are a number of additional files that you'll find in most of the theme folders. They are as follows:

  • The screenshot.png file is the little thumbnail that ...

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