How to only display one category in a WordPress gallery with multiple categories

In this tutorial, first we will learn how to create a WordPress gallery with multiple categories. A demo created with the tutorial is as follows: WordPress Gallery with Category Filter. You can click the category buttons on top of the WordPress gallery to show different categories.

In some cases, you may want to add the same WordPress gallery to other webpages, but only want to display one of the category. In the second part of the tutorial, we will learn how to only display one of the categories by using gallery shortcode attributes.
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