The suit of Pentacles symbolizes the element of earth: the drive to nourish and nurture; the manifestation of abundance as well as material energies.
The Threes in the Tarot are dynamic. They are about growth, expansion, movement and communication.
The Three of Pentacles represents collaboration with others. Just as you bring your own skill set to a project, others bring their own expertise. The Three shows that working well with others can create something larger and more complex than what you could achieve on your own.
You are advancing in your skill set; improving in your own work and progressing in your education.
Work and cooperate as you move upward in your field of endeavor.