You can check for device updates by opening the “General” section of the Settings app, or by connecting your iPhone to your computer and opening iTunes. See Update iOS for details on updating your iPhone.
“Title,” “Heading,” and “Body” will all change the text emphasis. You can also create bulleted, dashed, and numbered lists. The lists will all use the “Body” text format.
Tapping “Return” while using one of the list formats will create the next entry in the list.
For example, in a note about remodeling a room, the title of the note could use the Title format (“Remodeling ideas”), while the Header format can be used for the different sections (“To-Do list,” “Contractors,” “Paint colors,” etc. )
Use numbered lists for lists where you need to perform actions in order, and bulleted or dash lists for items that don’t necessarily need to be in order.