Should a complete beginner buy weighted or semi-weighted keys?

Weighted keys (hammer action) are the correct choice for anyone whose primary goal is learning piano. Weighted keys build the finger strength and dynamic control that piano technique requires. Semi-weighted keys are faster and more portable but do not replicate the resistance of an acoustic piano, which means technique learned on them does not transfer as cleanly when playing a real instrument.

What does "graded hammer action" mean?

Graded hammer action means the key resistance changes across the keyboard — heavier in the low bass register and progressively lighter toward the high treble. This mimics how an acoustic piano actually feels: the larger hammers in the bass require more force to move. Instruments with graded action feel more realistic and help develop proper touch control across the full range.

Can semi-weighted keys hurt your chances of getting good at piano?

They can slow your progress if piano is your primary goal. Semi-weighted keys require significantly less force than acoustic piano keys, so fingers do not develop the strength needed to control dynamics and articulation on a real instrument. Players who practice exclusively on semi-weighted keys often find acoustic pianos feel heavy and unresponsive. For piano students, fully weighted action is the right investment from the start.

Are semi-weighted keys better than weighted for synth parts?

Yes. Semi-weighted keys are faster to play — less resistance means quicker repetition and lighter touch for organ smears, fast synth leads, and chord stabs. Many professional keyboardists who play both piano and synth parts on stage prefer a semi-weighted controller for non-piano work. The reduced physical effort also matters over the course of a long gig or recording session.