How do I use the bulb mode on a Canon 70D to capture long exposure photographs?

To use the bulb mode on a Canon 70D for long exposure photos, set your camera to manual mode, adjust your settings (such as aperture and ISO), then select bulb mode on the shutter speed dial. Press and hold the shutter button to start the exposure, and release it when you want to end the exposure. Use a remote shutter release or timer to prevent camera shake.