You don't have to take a children's writing course from the Institute of Children's Literature in order to benefit from the massive amount of information on the Institute's website (although I did take the course many years ago and can highly recommend it.) You will find articles on every writing topic imaginable from getting ideas to marketing your polished picture book or young adult novel.
You can also sign up for their free weekly eNewsletter to receive information about live interviews scheduled with writers and editors, new articles and interview transcripts on writing, upcoming writing contests, and other news for writers.