How does the preksha meditation improve my mental health?

Emotion regulation: Focusing on your breath and returning to your breath after distracting thoughts and emotions strengthens the ability to sustain attention, regulate emotion, and develop well-being. There are intersting neurologic correlates to this, with increasing fibers in the acc and increased prefrontal cortex activity.

Abdominal breathing: Studies have shown that meditation can have positive effects on your autonomic nervous system, your immune system and your hormonal systems, thus rebalancing your overall metabolism. Proper abdominal breathing techniques are paramount in achieving the relaxation response. You do not need to be a master. Find someone who can teach you this and then practice it consistently.