First 3 weeks say about the history, the safety and what is actually a driving plan.
The other 3 weeks go really deep inside physics and mechanical engineering and many people find it hard to follow there, especially if they come from different backgrounds. I come from computer science.
In week 7, they explain the CARLA simulator and they have done a terrific job on that, kudos.
The thing is that through week 4-7, the quizzes and the assignments get really hard and many people say in the forums that find it hard and they needed to be more documented and guidelined, like the Deep Learning Specialization from Andrew Ng, from example.
The course has potential but I think there exists a problem right now when 20-30% of people pass quizzes on the first time. I hope that the team will take that into consideration and edit their resources.