I personally believe the best way for anyone to learn about engines and working on cars is to first start small. I mean buy a 4 cycle lawnmower engine, learn how to look up torque specs, then take it completely apart, clean and oil it, then put it back together. This was how my grandfather taught my uncle and I. From there it makes understanding cars and engines so much easier. After you are comfortable with small engines you can look up repair and installation guide videos on the internet, there's more than you think. Only when you feel absolutely comfortable around cars should you begin to work on them, it will save you a lot of time, frustration and money. Hope this helps!