First of all, the ability to link documents, pdf’s, videos, and worksheets into documents, without them actually being in the document, so for example, you can have your math notes on the left, and your textbook on the right so you dont have to open a seperate window to look at your textbook, you can just upload it from your files, also being able to link videos in for science if there’s a video that has good ideas, also being able to make the files editable, so if i add in a worksheet i can just do that while looking at my notes. Also a calculator imbedded into Goodnotes that you can open when you want