Everyone should take a CPR and first aid course. The Red Cross and local Fire Departments frequently offer them to the public.
Approx. 35 yrs ago, after being airborne for 75 feet, Mr. John Q Public took a hold of my head and moved it all over the county asking if my neck hurt. I knew even then that wasn't the thing to do, but no one in the crowd corrected him either.
It is best to learn the correct way to help so as to not harm or kill...