I was wondering which composer(s) do you suggest I should practice piano exercises from? I currently have some Czerny and Hanon (Since they were the only ones I have heard of that composed piano exercises before). But I recently heard of Hermann Berens, will his exercises be beneficial to the learning pianist? Are there more exercises out there that I have never heard of but are very helpful?
P.S. I stopped working on Hanon's exercises, I only use Czerny's as of now.