诀窍 juéqiào secret
secret; trick; knack; key
How to remember 诀窍: 诀 to take leave of + 窍 hole = secret.
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How it is used
- The knack or insider trick to doing something well - 掌握了诀窍 (zhǎngwò le juéqiào) to have mastered the knack; 成功的诀窍 (chénggōng de juéqiào) the secret to success.
- About skill/method, not a hidden fact - that's 秘密 (mìmì). 诀窍 is practical know-how.
- Near 窍门 (qiàomén), which is more colloquial; 诀窍 sounds a touch more polished.