>>508554852Sun Tzu discusses concealing one's own military strength from the enemy, exaggerating it, or otherwise disguising it in order to lure the enemy into that is advantageous to oneself. He is not speaking in overly abstract nonsense.
Through psychological warfare and information warfare, he suggests that by misleading the enemy about the location and intentions of one's own forces, dispersing the enemy's forces, forcing them to undertake long-distance marches, and pitting one's own strengths against the enemy's weaknesses, even a numerically inferior force can defeat a superior one. For that era, it was truly incredibly advanced.