Heading

The image above is added by editing the node (Edit tab instead of this Layout tab) and adding an image in the image field.

If you'd prefer to add a full width image with text over it, like on the home page, don't add an image to the page like above and use the Hero Image + Header block in a section with the full container type setting. Keep in mind, this was designed for the home page, so consider if you really want to place it somewhere else. You may want to reserve something like this only for the home page.

For a page where you want to display related pages menu on the right column, choose a section with two columns. Use the middle container type. Select with gutters. It will feel tight when you're looking at it in the Layout view, but it will be as designed when published. For column widths, use 67% and 33% on widest width, 100% on middle width, and 100% on narrow width.

To add the menu block, add a block but instead of clicking the blue button at the top, look down the list for the "Main Navigation" block option. Title it as you want (usually Related Pages) and adjust other settings to get the depth as you want it. This block won't display when it's narrow enough not to have multiple columns.

The middle container type is also appropriate if displaying Updates or Events content type in a single column. 

The wide container type is good for displaying the featured links block type, as shown below.