My favourite hobby is drawing. Now I'm trying to do that as my job. I draw on a graphic tablet, simple stuff, using Photoshop. I like to study how to draw. It's really interesting to investigate how this computerized program works. For example, if you want to draw a man in simple clothes you need to know anatomy and how muscles work, for example, why is this man standing in this position and why are these parts of the body visible. Also, you should understand why the colour of his skin is not plain, but it's red, yellow or blue. The colours of skin and clothes of this man depends on the colour of the environment and what light is used so physics involved too.
This knowledge makes me more broad-minded and more inspired to learn and draw more!
(Have a good day! ☀️)