How do you know the difference? Research the particular skill that's the subject of their article.
I was lucky enough to have a wonderful writing coach. She's British and the Brits tend to stick to the rules when it comes to writing - well most of the time. I have read a few books with British author's who like to head hop or use too much info dump, but most are a pretty good read.
In America we aren't taught strong skills when it comes to writing literature. At least not in high school or the lower grades. I'm not sure when it comes to colleges, but it seems as though the writers who have degrees in creative writing tend to put out nice, tight novels.
I think going with your gut, and a few google searches about the topic, should satisfy the correct creative writing skills you are striving for.
As with anything, take advise with a grain of salt - even mine. I am only telling you what I do in these situations. I think most writing skills sites are pretty good for the most part.
So do your research. You want your writing to shine. After all, isn't that your goal?
Have a wonderful weekend and if you get a moment leave me a comment and tell me what you're struggling with, or maybe some great writing sites you've discovered!