DC Universe (https://www.dcuniverse.com/)
This website is the official hub of DC Comics' shows, movies, comics and the community of its fans. As such, it contains a substantial number of titles, including Superman (as well as titles he's connected with) in various media-formats, as well as a character-encyclopedia. If someone isn't a fan of comics, or even reading in general, they can still gain an understanding or appreciation for the character through the various shows and movies available.
"Superman Homepage" by Steven Younis(https://www.supermanhomepage.com/)
The Superman Homepage is an extensive source of information (from several media-formats) on the character Superman. This website has been around for 25 years, originally run by Andrew J Gould and now by Steven Younis. It has reviews, news updates, videos, external links (for merchandise or more information), a timeline, images, and more. Although technically a fan-site, the work put in is undeniable, and is even associated with Amazon.com. Avid comic and pop-culture fans, as well as artists and American historians, are almost guaranteed to find something of value on the Superman Homepage.