If you have to play online casino you got to be trained.  You can get trained in poker with or without the help of a poker coach or a poker school. Some players play just for fun, and some will be playing with a huge big dream of winning and making a lot of money, by winning in the online casino sites at some point in life.
Those who play for fun might not necessarily have a poker coach; however, but those who are aspiring to get to some real good places in poker will do better with a poker coach.
Interestingly, when it comes to online casino there is no need for everybody to go to a poker coach personally since every casino site is a poker school and when does play poker online they naturally get trained.  The teacher is always there in online poker it is just how the student make use of it.
There are several play online casino sites which does have tutors providing tutorial videos for absolutely free, some are paid though.  Those who are not interested in spending money or those who are not having sufficient money to spend on coaching will be able to get experience by watching such video coaching.