Hi, In my opinion, Pixel art is the simplest, It might take you a few hours to learn pixel art, or it could end up taking you a few years to master. Actually, It depends on your learning style and how deep you want to go into the learning process. I am a college student and recently I did my academic essay about art topics, Luckily I got this resource writingbros.com/essay-examples/art where they shared some good information on this topic that can inspire me to finish my academic paper successfully. Anyway, if you become an excellent pixel artist then you should start watching free online tutorials of varied subjects and practicing regularly.