Concepts and Big Picture

I don't think there is a review video. Sometimes Pasan has a video at the end of a course that's roughly 3 minutes long that discussed what you should take away from a course.

If you're taking notes the best way to review the videos is to just read over your notes. You can also rewatch the videos. I do this sometimes. I always change the speed to at least 1.5x after watching the first time, because I'm better at catching on the second time through.

The best way at getting better at knowing how to write the code on your own is just practicing. In my experience you can't really learn something until you've given it some practice. This means you may need to create projects, make things up in the playgrounds, toy around with some of the code Pasan writes.

In case you're having trouble with subclasses you can just think of it as an extension of an already existing class. It's like basing a new class off of an existing class. For example, all vehicles have some properties, but not all vehicles are the same. There are also trucks, bikes, etc. These vehicles share some properties but not all of them. But all cars, in this example, have 4 seats so we can set that as the default value.

Hopefully that cleared things up and didn't make it worse.

class Car: Vehicle {
  var numberOfSeats: Int = 4
}

let someCar = Car(withDoors: 2, andWheels: 4)

Happy coding!