WordPress comes with a built-in feature that lets you create a gallery. This feature is very basic and does not have many options, but it gets the job done.

Here is how you would create an image gallery in WordPress without using a plugin.

First, you would need to edit the post or page where you want to add the image gallery. On the post edit screen, click on the ‘Add Media’ button to upload your images.

This will bring up the WordPress media uploader where you can click on ‘Select files’ button to upload your photos. You can also select photos you have previously uploaded from media library.

After uploading and selecting your images click on the create gallery link from the left column..

Next, you need to click on the ‘Create a new gallery’ button.

Media uploader will now show your selected images with gallery settings. You can add captions to each image in your gallery.

You can also select how you want the images to be linked, number of columns, and image size to use in gallery.

Once you are done, you can click on the ‘Insert gallery’ button.

This will close the media uploader popup, and you will be able to see your image gallery in post editor.

Lots of the times galleries, depending on the theme or plugins you use – can have options available. You should be able to see them in the right column, in the gallery settings section.