Food Protection: Free Online Training. If you are a supervisor in a restaurant or non-retail food service establishment, you must receive a City certification in food protection practices. To receive a certification, you must first complete the free Online Food Protection Course, or pay to attend the course in person. The online course is offered in English, Spanish and Chinese. The course is self-paced and consists of 15 lessons. You must complete each lesson and pass a quiz before moving on to the next lesson.