No matter what type or style of art you’re interested in making, it’s hard to know where to start. You have all this excitement, but aren't sure where to direct it!
Every artist’s process is going to be different, depending on their influences, subject matter, medium, philosophy, training, etc. Focus on developing yours
Have you ever started a picture, only to realize that you don’t have enough room to paint without the objects running off the edge? You need to understand aspect ratio because it tells you how to frame your drawing or painting subject.