Extend WordPress Functionalities

How to Add One Custom Field for Many Posts in WordPress

Use this code snippet to add the same meta data value for multiple WordPress posts at once. Here I provided solutions that save one custom field in many posts.
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How to Add Thumbnail Support to the WordPress Theme

If you do not see the set featured image box beside the post editor in the WordPress admin panel to set the featured image of posts, your solution is here. Just copy/paste this code snippet to the function.php file of your theme.
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How to Use add_theme_support Function in WordPress

add_theme_support function in WP will register a feature for the specified theme. Here are a few examples of using the add_theme_support() function in WordPress development.
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How to Add a Custom Section to Settings Page in WordPress

Learn how to add a new section to the settings page of the WordPress admin panel with examples. In this WordPress tutorial, we’ll introduce the WordPress add_settings_section function and review its usage with examples.
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How to Extend WordPress Posts Query and Join New Tables

Learn Extending Posts Query in WP, Join Custom Tables and add new fields to Post Items In this advanced WordPress Development tutorial.
WordPressWordPress Plugin DevelopmentWordPress Theme Development