A car is made up of many different parts. As such they are complex. However it is important to know the basics of a car if you want to go into engineering.
Knowing what happens when you start a car is important. This will give you a good foundation of what happens, and also how to diagnose a fault when your car does not start.
It is good to put down onto paper what you have learned at the end of each lesson. This helps your brain store information and will help you recall information when needed.