If you want to make a page related to WikiProject Harry Potter featured (whether it is an article or a list), you have to apply sources to every piece of information. Any information given in an article should be verifiable by a reliable source. If you want to make a page featured you probably need at least 30 references. There is some confusion as to what proper sourcing is and therefore this guide is made to help you save time and go for the right source right away.