Types of sources:
Popular source VS scholarly source - A popular source is designed for a general audience who does not have advanced knowledge of a particular subject. They are used to entertain, inform, and sometimes, to persuade the reader in a biased manner.
A scholarly source is designed for a specific audience who has advanced knowledge of a particular subject, or for those studying that subject. They are used to share findings or developing research in specific areas of study. An excellent chart demonstrating how these differ is located here.