Each instructor will provide his or her extensive bio and list of experience as well as detailed description of their courses. Also each course comes with a free intro, which is like a sample and where you will have a chance to get to know the teacher, get a sense of his or her style of teaching, material covered etc. Besides that, very soon students who have completed the course will be able to review the course and give star ratings and we are working at having a peer-review process to have other professionals vet for the quality and accuracy of the content. Let's not forget that you have a 30 day money back guarantee for any course you have only completed up to 59% of the class. If by then you feel the course will not fulfill your expectations, you are entitled to a full refund.