A quick visual guide to basic bike components and accessories:

Gear Essentials: Bike Tires2 Suspension2 Mirror2 Cyclometer2 Headlight2 pump2 Waterbottles2 locks2 Fenders2 Taillights2 Tools2 mirror cyclometer Headlight Tires Suspension Hydration Pumps Helmets2 Helmets locks Fenders Taillights Tools Wedge Wedge2