I have always been very grateful with the answers I received on mathematics stack exchange, they often unstuck me right away. But if the best advice we can give to a student is: "study the classics, the original papers, go to the source", then isn't a reference to a textbook in place with each answer? A publication, expository or new research wouldn't be accepted without references. I don't mean that step by step detailed explanations should by replaced with references to textbooks but I think it will help the OP by giving him the source of each answer. IMO a good answer is an accessible exposition of ( for example ) a theorem in some textbook. Questions about exercises can be answered by directly giving the answer ( does that really help? ) or by providing references to the needed theorems and an example of applying them. - My question is basically a discussion topic. What do you think?