ES actually works pretty well with the ACD methodology. Fishers main markets are the energies, ES, and ZB. I think for a beginner all these markets move too fast for someone who doesnt have a strong grasp of the method. I would recommend the ZN which is basically a slower version of the ZB. The ZN doesnt follow the ACD as well but it is a good market to start off with. Once you have an understanding and have some time sim trading i would say the ES. But at that point you could really trade the ES, CL and ZB with the ACD method.