Hi Giuseppe, thanks so much for commenting! :-) I would love to have a good teacher, but there is none where I live, not even in a 100km radius... And my internet is too slow to follow a skype lesson. So, it seems that I don't have an other option than learning by myself. But I am following some great teachers on YouTube, like Heather Broadbent, Todd Ehle and others.

I also practice scales and I am working on Etudes by Wohlfahrt, Hans Sitt and Robert Pracht.

Do you have other suggestions for good technical books?