Nielsen Norman Group are the leading authority on UX best practice. Their site holds a wealth of information, how-to guides, and research.

The Growth.Design team explain UX psychology through real world case studies in an engaging weekly comic format. Explore their case study library, or visit the Psychology section to learn more about cognitive biases and principles affecting UX.

A book and website by Jon Lablonski, a collection of best practices that designers can consider when building user interfaces.

The Behavioural Design System by Coglode is a free Figma project which allows you to easily reference behavioural science in your design work.

Harry Brignull's website and book provides a taxonomy of deceptive UX Design patterns, and a 'Hall of Shame' of case studies.