@cyn-shar,
Piano technique is part finger speed, part lower-arm speed (for jumps and octave passages), part coordination, timing and control. On top of that, the most important part is to do command these skills without ruining the muscles, tendons and joints in your hands and your lower arms.
How to learn these things? From a good piano teacher, as judged by how his or her students play. If you're asking about technique-building pieces, I'd go with Chopin. Start with some easy waltzes or mazurkas, then work your way up through the nocturnes and preludes to the etudes. I have no idea
why Chopin has such a good effect on the technique -- but he does.