Information on Olympic Lifting in English is not available in large amounts and what is available can run the gamut from excellent to absolute trash. The movements are technically complicated, there is little information (again, especially in English) on them and many who teach them, frankly, have no clue what they are doing.
Mind you, this isn’t different for other movements in the weight room but the OL’s are pretty technical movements and a lot is going on in a very short period of time.
A lot of strength coaches seem to think they know what’s happening/what they are doing but, when you watch their videos (cough cough, Mike Boyle and Dos Remedios) it’s clear that they do not. You see gross technical errors which said coaches then make chronic excuses for.
I’ve even seen DVD and other teaching products that, flatly, taught stuff incorrectly. And not just on the Youtubes; I mean professionally produced and priced stuff. But I’m getting off topic.
The state of Olympic Lifting in the United States has made learning the movements or learning to teach the movements somewhat problematic. Certification is a first step but not everyone has access or time; and the afforementioned DVD products can run the gamut from quite good to absolutely worthless/detrimental.