What it is:

To add more than one photo to a page and blog post in a grid or tiled gallery-type line of photos. Have you wanted to arrange your photos better on a page or post but can’t figure out how? Try a gallery!

Why to do it:

It adds some visual interest – just another option when blogging or swapping in new photos on your site.

How to do it:

1. On a post or page, go to “Add Media” then select “Create New Gallery.”
2. Select all the photos you want to include and select “Create New Gallery”
3. Choose options
   Link To: Do you want it to link to the image or nothing? If you want the pictures to link to a URL, use this plugin.
   Columns: How many columns do you want? 4 across, 2 across?
   Size: I prefer medium or above
   Type: I will show you what the tiled gallery and thumbnail gallery with medium images:

Bonus: 

Using the Jetpack plugin,  you can have more gallery options, like this cool tiled mosaic gallery:

Quick Video Demo