Books I found useful when planning solutions and software architecture, and when working with code. Books which help you to build more sustainable for the long term, and books which are more practical when it comes to game-dev and real-time rendering.
Books I found useful for building and scaling-up teams, managing people and projects. I'm a big fan of people focused, Agile management, but there are also some books which deal with hard project management skills.
Books I found useful when working as artist and when directing other artists. Mostly books about concepts and techniques that stay with you over the course of your career.