顺 (shùn) is a versatile word meaning 'to follow' (a person's will or a path) or 'smooth, going well'. As a preposition meaning 'along', it's interchangeable with 沿 (yán) in physical directions, but 顺 is more common in everyday speech. As an adjective for 'favorable', it's less formal than 良好 (liánghǎo) and 有利 (yǒulì), and used for personal situations (e.g., work, life) rather than objective advantages.