Short notes on Headers and Footers -
Headers and footers are the top and bottom sections of the document respectively. They are separate sections from the main document, and are often used to hold footnotes, page numbers, titles, and other information.
The header and footer controls are in the Header & Footer group of the Insert tab. (Insert>Header & Footer)
The Header and Footer options each contain a dropdown menu. Click one of the Built-in options to insert it, or select Edit Header (or Edit Footer) to edit the header (or footer).