优点 (yōudiǎn) is the most common word for a personal strength or merit — a quality that makes someone or something good. It contrasts with 好处 (hǎochù), which focuses on practical benefit or gain, and with 优势 (yōushì), which means a competitive advantage over others. 长处 (chángchù) is a close synonym for 'strong points' but is slightly less common in everyday speech.