I want to know an easy contouring method for beginners.

My face is round, so it is wider than it is vertical.

Because of my face shape, I want to try contouring by shading the edges, but it feels harder than I thought, so I haven't been able to give it a try. I would like to know of some contouring products or methods that even a beginner like me can use easily.

Please give me lots and lots of recommendations!