Properly-fitted helmets provide protection from a potentially life-threatening head injury. By law, bicycle riders under 18 years old must wear a bicycle helmet while riding on a public road.

The following steps are the most important, especially with the Mtb:
Ride in the same direction as traffic so you are more visible to drivers entering roads or changing lanes in the following scenarios:
Don’t forget to signal a lane change by holding your left arm out to the left side of your body and signal a right turn by holding your right arm out to the right side of your body.
Even if you obey all traffic laws, there is always a risk of a collision.
Wear waterproof gear as needed. You might even carry a small backpack to hold lightweight extra layers and other essentials for every ride.
Wear sunscreen, especially on the back of your neck. Wear long sleeves with breathable fabric. Wear sunglasses.
Ride with a buddy. Two cyclists will be more visible than one. Plus, if something happens to you, your buddy may be able to facilitate the emergency response process (and vice versa).
Bring drinking water for longer rides. This is especially important if you’re mountain biking and racing bikes in the Summer season.
Wear bright colors and reflective clothing, especially in the early morning, late at night, or on cloudy days.