I think you'd betterUsed to give advice or a recommendation in a conversational, relatively gentle way. The verb or phrase before 方がいい indicates what is recommended; with a negative verb, it means “I think you’d better not.”
JA: 疲れているなら、今日は早く寝た方がいいと思うよ。
EN: If you're tired, I think you'd better go to bed early tonight.