Page setup decides margins, orientation, and where one page ends and the next begins.
In the Layout tab: Margins sets the blank border around the edge of every page; Orientation switches between Portrait and Landscape.
Ctrl+Enter forces the rest of your text onto a new page immediately, instead of waiting for the current page to fill up naturally — the correct way to start a new chapter or section on its own page.
Use a real page break, not blank lines
Pressing Enter repeatedly to "push" text onto the next page looks the same until you edit anything earlier in the document — every extra blank line shifts. A real page break stays put.
Layout tab → Columns splits the page into two or more side-by-side newspaper-style columns — text flows down the first column, then continues at the top of the next, the layout newsletters and some flyers use.