When you want to give someone advice in Japanese, one of the most frequently used expressions is たほうがいい. It's used to say what someone 'should' do. To form it, you take the past tense (た-form) of a verb and add 方(ほう)がいい.

• 風邪(かぜ)だから、早(はや)く寝(ね)た方(ほう)がいいよ。
  Since you have a cold, it would be better if you went to bed early. (You should go to bed early)
• その件(けん)は先生(せんせい)に相談(そうだん)した方(ほう)がいい。
  It would be better to consult your teacher about that matter. (You should consult your teacher)

The word 方(ほう) literally means 'side' or 'direction'. By using it here, you are implying that out of all possible options, doing the action is the superior or more advisable 'choice'.

This grammar pattern is very direct and carries a strong sense of recommendation. It often hints that not following the advice could lead to an undesirable outcome. For this reason, it's often translated as 'It would be better if you...'.

たほうがいい may also be combined with the dictionary form of a verb. However, in these cases it expresses a general preference or a commonly held belief rather than direct advice to an individual.

• 野菜(やさい)は毎日(まいにち)食(た)べる方(ほう)がいい。
  It is better to eat vegetables every day. (This is a general opinion)
• 分(わ)からない言葉(ことば)は辞書(じしょ)で調(しら)べる方(ほう)がいい。
  It is better to look up words you don't know in the dictionary. (This is a general opinion)

Caution

Given its direct nature, this expression can sound too strong depending on the situation. When offering suggestions, especially to someone of higher status, a softer phrase like ばいい is often a more suitable choice.