Technical Sidemounting is training for existing tech divers to try new equipment configurations that may suit them better for the diving they are doing, such as wreck diving in tighter passageways or just a change for a more comfortable and sleeker rig.
The training will teach you everything you need to know about diving this style safely and competently and though not a „course“ as such is essential training for those wishing to sidemount with stages or on dives requiring decompression.