EMT classes do teach most of the things that people generally interested or needed to know. They teach actions online through the use of videos, graphs, photos and etc., even though there are no practice.
I would go to the L'ecole Culinare. They will teach you everything you need to know about baking and culinary.
I prefer Academy of Art University. They teach photography through online and you will really learn the things that professional photography should know.
You can find more information about costmetology by contacting the local cosmetology institue in your area. Here they can teach you everything you need to know about cosmetology.
To be a marine sniper your not required to take any certain classes in High School. I'm pretty sure you don't even have to graduate. The Marines will teach you everything you need to know.
They do it on purpose, not to intimidate you but to make sure you know everything they teach.
CPR classes are a wonderful knowledge to know. They teach you how to save a persons life. Teach you how to check if a person is in need of CPR. Teach how to check if they are choking. If the techinque is done propely you can save a life. Some classes teach CPR for children and adults.
Sheffield School offers excellent interior design online classes.
almost everything they teach at MEDICAL SCHOOL MAYBE . . .
Day trading platforms are tutoring classes you can take to teach you what you need to know about trading. And these classes teach you the right ways to trade without losing money!
I dont know of any free online writing classes as such, but there's plenty of websites that will share help and tips about how to write online.
It is easier to teach little kids because you would have to know everything to teach a big kids :)
As far as I know there are no specific customer service classes. When you get a restaurant management classes you learn everything you need to know about customer service too.