I’m getting the hang of it now. I wrote this out to help my brain process what Jonathan was doing. I thought I’d leave it here if anyone else came across this post and felt stuck.
My advice is rewatch the video multiple times, and write down what Jonathan is doing and the reasons why he is doing it. I think that helps.
p.s. not saying my understanding above is perfect, so don’t take it word for word – I’m just trying to point you in the right direction.