Hammer-ons are a great way to build speed on the guitar because they allow you to play notes smoothly and quickly without picking every note. By using your fretting hand to “hammer” onto the string, you can add notes while your picking hand keeps a steady rhythm or plays fewer strokes. This reduces the amount of picking required, letting you play faster passages with less effort. Hammer-ons also help improve finger strength, coordination, and timing, all essential for developing speed and fluidity in your playing.