Breathing Styles, Project Slayers Wiki

All known Breathing Styles currently taught within the Demon Slayer Corps are derived from Sun Breathing, the first style ever created. The majority of known Breathing Styles mimic a certain element of nature (i.e. flame, water and wind) and replicates it with the user's movements, techniques and abilities. The weapon attacks of Demon Slayers who use Breathing Styles are also longer ranged, possibly due to shockwaves or air pressure generated from their weapon itself when swinging and striking.

In Demon Slayer Kimesu no Yaiba, is it possible for a demon to use a breathing style technique? - Quora

Sound Breathing, Project Slayers Wiki

ALL BREATHING SHOWCASE! Which Is The Best Breathing Style?

Create a Project Slayers Breathing Style and BDA Tier List - TierMaker

Water Breathing, Project Slayers Wiki