The stylus-enabled smartphone is called the Galaxy Note5 for a very good (and obvious) reason. One feature introduced in the Note5 is the ability to write memos down without needing to wake up the phone. Called the Screen Off Memo, it starts the moment you remove the S Pen from its dock. It can be handy if you need to jot a point down quickly without having to flip through pages of apps, especially for something transient like copying the groceries list onto the phone, or helping someone pass a message along.
For notes that will be referred to within the day, there's Action Memo. This option lets you pin notes onto your Home screen, as a widget. It's handy if you need something done after a busy day at work, with errands you can't afford to forget running before heading home.
Even with these options, the full-fledged S Note is what defines the Note5's note-taking experience. In a nutshell, this in-built app lets you write, and it also allows you to annotate or illustrate with photos taken instantly via Photo Notes, topped off with the ability to record audio as well. What you get is a suite that's perfect for producing minutes for the meeting, or digesting an extremely important lecture.
One handy bonus is how the S Pen lets you sign off PDF documents. Simply open it and choose 'write on PDF' via the Annotate on PDF feature. If your office is in the habit of excessive red tape, this feature eliminates one reason for you to double back to the office, or pull out the laptop just to append a signature to a simple document.
Save your work in Scrapbook (bottom) if you want to attach cropped images, or URLs for future reference.