All bikes with the exception of penny-farthings are geared between the crankset and the rear wheel. Most bikes will include a range of gears, so that you can choose one appropriate to where you’re ...
When you were first learning how to ride a bike as a kid, the bike you were learning on probably didn't have any special bells or whistles on it, aside from perhaps a literal bell on the handlebars.
Think of riding your bike as a spectrum. On one end, you cruise around the neighborhood for fun in your spare time. On the other, you don a skinsuit to set a new personal best at your local sprint ...