The word **诀窍 (juéqiào)** is a compound noun formed by combining two characters with related meanings: **诀** originally refers to rhymes, formulas, or mnemonic verses (like口诀, meaning pithy instructions), implying a concise, essential method or secret; **窍** literally means an "aperture" or "key point" (as in 窍门), metaphorically representing the crucial trick or the pivotal insight to mastering something. Together, they create a word where **诀** contributes the idea of a summarized secret or method, and **窍** adds the nuance of a clever, key insight, resulting in the combined meaning of "knack," "trick of the trade," or the essential skill or clever shortcut to success.