Several users recommend websites for learning about physical cosmology, highlighting resources like Physics Forums, which offers a variety of textbooks and articles. Another suggested site is Cosmology 101, featuring numerous articles and textbook-style content, with an emphasis on the common misconceptions section. Additionally, a tutorial from UCLA's astronomy department is noted as a valuable resource. These sites collectively provide a solid foundation for anyone interested in the study of physical cosmology. Engaging with these resources can enhance understanding of the subject significantly.