Articles
To get started in the field:
To learn the basics of UX design:
Design Patterns Articles and Videos from the Nielsen Norman Group
Design Process Articles and Videos from the Nielsen Norman Group
Web Usability Articles and Videos from the Nielsen Norman Group
Books
Books that give a great introduction into the field:
Don't Make Me Think (I think it's good practice for UX designers to know a bit about UX research.)
Books that provide great overviews of UX design and communicating UX design systems:
Books I haven't read, but they look like they would be useful:
Websites
Nielsen Norman Group (They've done all kinds of research on usability patterns and web design and usability testing, AND they offer all kinds of how-to articles and videos! I've always wanted to attend one of their conferences!)