Breathwork is a Western term for a practice that has been done for thousands of years in other parts of the world. The hype follows the success of other concepts such as mindfulness, which also has a basis in psychology and has ancient predecessors. To get into this trend and to see if it can reduce your stress, try taking a breathwork online course.
Like other forms of applied psychology, the concept can be simple at first glance but have many little details. It pays to listen to an authentic and trained practitioner. There are a few hangups such as overstimulating the nervous system with too much oxygen. While the practice is more natural than taking drugs and practically free once the skill is obtained, getting the right training is a matter of caution. Find information at an informed website.