I think that the articles are mostly written by teachers that use this site to get students. I guess that by writing a good article, they will get more students, so it is a win-win: anyone here can use the articles, and the teacher gets more business. I've just read one that had a simple but useful tip. I guess you need to look through the articles that are about learning the language that you are learning, and see if any of them are useful to you. You have obviously already found out about the answers, notebook and discussion!