Yes this is said multiple times to people trying to lear anatomy but-

splitting your body parts into shapes is the best way to learn anatomy like for my shoulders I would use a line from the neck to were the arm starts and add a circle ,

but there is a way to help beginners in this topic

Well if you want to learn in a more officiant way grab a picture of any pose you want and practice splitting it into shapes as many as your can on the top picture I don’t have MANY shapes I’m looking to see more that doesn’t mean go scribble in your sketchbook or iPad it means look at the reference and point out the difference shapes you see and draw them on trust me it will help!!!!