WordPress: Enable Featured Image In A Theme

Most themes already come with this support but if you are building one from scratch and you want to add this ability, just add this add_theme_support code to the functions.php file.
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WordPress: Get Featured Image URL

Get the post featured image url with this code.
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WordPress: Register a Sidebar (Widget section)

To register a sidebar for the widget area in WordPress, use this code.
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WordPress: Get Post Permalink

To get the post permalink in WordPress, use this code.
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WordPress: Get Post META

To get post meta data in WordPress, use this code.
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