For example my question is "A pianist Valentina Lisitsa like as did have to Obtain her awesome technique ??"
You asked a very good question, and we can only give you different, personal anwers. I will focus here only on one important part: How to get a feeling for harmonies, modulations and a beautiful voice-leading?For more than a year I have been using two new, excellent, Bach books with my piano students. I hope you can lay your hand on them somehow. I will share some information here:1 ) One is an excercise book for quality Bach harmony and beautiful voice-leading2 ) Book with answers: All Bach´s Chorales ANALYZED, with chords, modulations - very exact Roman Numbers ( also all inversions) are below the piano score - modern (Jazz type) exact CHORDS are simultaneously above the piano score NOTICE: This spark of genius to simultaneously show Roman Number analysis AND modern Jazz chords in Bach has opened my students´ understanding and personal creativity - the same happened to myself as teacher I got my own copies sent to my home here in Scandinavia in 2013 for 45USD from Amazon.com. The author and books are CHRISTOPHER CZARNECKI: J.S. Bach 413 Chorales Analyzed the excercise book has the same name but without "Analyzed".There is a good website about the Bach books, will try to LINK down here:https://bachchoraleharmony.com/There is a rather good Facebook page named: J.S. Bach 413 Chorales: AnalyzedI will try to LINK it down here:https://www.facebook.com/pages/JS-Bach-413-Chorales-Analyzed/831877606883957?pnref=story