Are you new to riding? Remember these things.
1. First thing to buy before you go riding; a new helmet.
Don't buy a used helmet, please. From looking at the outside of a helmet you can't tell if it has had a fall. The shock absorber in the helmet is there to protect your brain.
2. Have your helmet properly fitted with straps adjusted to fit you.
3. If you fall & hit your head you need to replace the helmet
4. Last of all wear your helmet every time ; every ride.