I've never used the site but those looked legit. It's probably a good idea to read those two articles at the beginning, you might get some helpful theory knowledge.

And as a general rule, you should always Google something before you ask the Pit, unless you're sure somebody will give you a straight answer. 80% of the time you'll just get sarcastic responses or **** that doesn't help you in any way.

I hope this fulfills what you're looking for.