Every section has a notes lecture titled "Section Notes" which contains all the important points covered in that specific section.
The purpose of adding them is so that you don't have to bother writing notes and instead you can focus completely on learning.
Notes are a great way to revise concepts you have learned, let's say you come back to the course a month later after learning, you don't have to watch videos, instead you could just refer the notes.
Pro tip: Keep the notes handy, if possible print them and refer them on a weekly basis so you remember what you have learned.