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The gallery feature in WordPress, allows you to add photos and multiple photo galleries to any WordPress page or post. Best of all, you don’t need a plugin to do it.
There are several ways to do this but the easiest option is to add the following syntax to a text area:
add this line of code in a text window. Once added, click the icon to edit the gallery then add the images and save.
Additional options include:
Specifying size: Values include “thumbnail”, “medium”, “large”, “full”
Here’s an example of the full syntax:
Learn more about Gallery Shortcodes at WordPress.org