Adding a picture gallery to a post or page is a great way to display a lot of photos at once. The instructions are the same for a page or post.
Creating an image gallery
To create an image gallery in your post click Add Media.
Select all the images you want to include in your gallery.
Then click Create Gallery.
Then by clicking on each individual image thumbnail at the bottom of the page you can change the setting for each individual image.
When you are ready click Create a new Gallery.