Introduce the page here. This column keeps the site’s reading measure, and the section rail beside it lists this page’s parent section and its sibling pages — it builds itself from the page hierarchy, so there is nothing to maintain by hand.
A section heading
Keep the body of the page inside this block. Text, images, and embeds all sit in the reading column alongside the rail.
A wide section
Blocks placed after the rail shell clear the rail and run the full wide width of the page — use this area for feeds, galleries, stat rows, or a call to action. Delete this group if the page doesn’t need one.