... for me it is the most important practice of all of Martial Arts, because Mahakala - Buddhist Protector - uses Knife. Knife as the symbol for cutting everything that hinders development.
... i've focused on Mahakala Practice since many years.
... i try to see Mahakala as Buddha, to get blessings & lessons as from Buddha.
Tanto is name for Japanese Knife.
Jutsu is combat method.
Do is the Way.
In Martial Arts, do always includes jutsu.