I’ve seen a lot of people say this section is difficult and has a large learning curve and I agree, first time I watched it I felt out of my depth and confused.
HOWEVER, watch the video for a second time once you have written your code with Ben and slowly watch/read and understand what is being said. Even rewinding a number of times to hear it explained over and over again.
This is an approach I took and it definitely helped me understand the lecture more.