"Action" describes how the keys respond to your touch. This is often the most critical factor for skill development:
These keys have resistance, mimicking the heavy feel of a real piano's hammers. They are essential for building finger strength.
The "best" keyboard depends entirely on what you want to play:
These keys are springy and light. While easier for beginners to press, they won't help you transition to a real piano. Just Bought a Keyboard? Don't Skip These Crucial Checks!