Drawing is one of my favorite hobbies.
I respect people that can draw but I am a terrible artist.
You should make the drawings easier to understand, by using familiar symbols, perspectives, units of measurement, notation systems, visual styles, and page layout.
So should I start with simple shapes?
Well, it depends.Artistic drawings are subjectively interpreted.
I think I need to learn the basics before I try to understand subjective interpretation.
You should use the style that makes is easier for you.The most important thing is to have fun.
What is the most famous painting of all time?
In my opinion, it is the Mona Lisa.
I think so too. It is iconic in so many ways.