Tā zhīdào jiànhǎojiùshōu, suǒyǐ cónglái méi zāi guò dà gēntou.
He knows when to stop, so he's never taken a major fall.
Tips
memory
Char-by-char: 见好 'see (things going) well' + 就 'then (immediately)' + 收 'pull back / wrap up'. Spot the win, take the win — same logic as English 'quit while you're ahead'.
