The Training Pod is one of two training objects, the other being the Library, that will allow you to study skills badges. While the library is much slower than the training pod, it is also free, while the training pod can get very expensive. During a training session, the countdown will appear above the training pod and rapidly drop until the session is over and the colonist gains their skill level. New skills will begin at basic skill level but they can use the training pod to further increase their proficiency in that skill, up to a total of four stars.