Recommended App: GoodNotes
GoodNotes is an app that comes highly recommended by many — especially those in the education field. GoodNotes allows users to take handwritten notes, draw/diagram, mark-up PDFs, and then save it all on a nicely organized “bookshelf”. In addition, GoodNotes allows for easy sharing, page turning, and highlighting. It also automatically saves your work and provides full backup to prevent data loss.