WordPress has built-in gallery functionality by default. A post can have several photographs added to it that are displayed as a gallery.
To create a gallery in a new post, visit WordPress admin area > Posts > Add New. Click the “Add an image” button in the WYSIWYG editor menu and upload the images. Those images will be shown in the gallery. You can then click on “Save all Changes“.
A Gallery tab will appear and once you click it, images can be arranged and do the gallery settings. Click “Insert Gallery” to add a gallery to your post.
You will be able to view the gallery in the newly published post on your blog once the article is published.