When Apple updated the Notes app in iOS 9 they added some really useful features including the ability to create checklists and to draw freehand in a note so that you can now write something in a note, draw a diagram or let your artist side show by doing some drawings.
It is also easy to take text from Safari, an email and other apps and create a note from it. You can also easily take photos from the Photo app and add them to a note.
You can also create note from a map so that you can add more information than just bookmarking a location.
When you create a note from another app you can choose to create a new note or add it to an existing one.
See how it works in this video.