Sorry you can't learn to groom a dog on line, if you did I wouldn't be a customer. That is one job you need to do a hands on course with.
if you have been grooming for 2years you can put yourself through your city and guilds exams, but it depends on the quality of your grooming, no point if your grooming isnt up to standard waste fo time and money. What sort of stage are you at grooming wise, can you groom a poodle in lamb trim to a good quality? If your grooming is already ok then grooming courses are pointless, you should have already covered what they will if you were really turning out that many dogs at your old job....
she not know of dezynadog?