Chopin's études are largely in straightforward ternary form. He used them to teach his own technique of piano playing—for instance playing double thirds (Op. 25, No. 6), playing in octaves (Op. 25, No. 10), and playing repeated notes (Op. 10, No.  7).
What pieces of his did Chopin use to teach his technique? What form are most of Chopin's études in? Chopin often taught his piano technique using what form of music he wrote?