The above video and music notation is an example of a lesson for an individual who knows how to read music. One can also listen and watch the video and by recognizing neck positions and left hand fingering and using the ear as a guide come to learn the piece. For the very curious, another method would be to learn the Cello Suite by ear and come up with one's own interpretation and phrasing. Another option would be to seek out Tablature written for this piece.
There are many different ways to learn music. It's not a one size fits all approach. The main thing is that if what you play sounds good or great to you chances are it will appeal to someone else.