Step by step :
1. Enter title here.
2. Fill the text editor with your content.
3. Add image here and the image will display as featured image.
Standard Grid Gallery have it's own feature. You can set the gallery image column from 2 column until 5 column images. You also be able to configure gallery layout with container or fullwidth or even inherit from "Theme Options". This gallery also allowing you to enable/disable space between each image.
Album page title result: