Everyone in the workplace, from the employer to the newest worker, has different but important duties to keep the workplace safe. Employers have the most authority in the workplace, so they have the greatest responsibility for health and safety. Supervisors are next in line.
Since you are a supervisor, your job involves taking direction from your employer and giving direction to the workers you manage. Because of your position, you need to understand the health and safety responsibilities of everyone in the workplace, especially yours.