adverb, adjective · it would be best to; used to provide advice or suggest a preferred course of action

你最好现在就出发，否则会迟到的。

adverb, verb · the most excellent or desirable; the superlative of good

这是目前最好的解决方法。

particle, adverb · of the highest quality or excellence; the most favorable option

这家火锅店的味道是全城最好的，经常要排队。