Reddit reviews Asteroid Goddesses: The Mythology, Psychology, and Astrology of the Re-Emerging Feminine

Asteroid Goddesses is probably one of the best books I've read on asteroids.

My take on Ceres is the same as my take on the other asteroids, it needs to be aspecting another planet (preferably a personal planet) within close orb to have any noticeable effect.

Ceres shows how we nurture others; it's almost a type of motherly instinct. And of course, the sign and house position show how that nurturing is expressed and in what area of life.

You can check out Demetra George's work on the asteroids, as she was a big pioneer in that arena. I don't think anything but the seven traditional planets rule signs.