Verb[ta-form] + ほうがいい
Verb[negative] + ほうがいい
The grammar structure ~ほうがいい is used to give advice or suggest what someone should or had better do. It can also suggest what someone should not do in the case of negative advice. It implies that following the advice will lead to a better outcome.
Giving Positive Advice: Use the ta-form of the verb to express that doing something is better.
Giving Negative Advice: Use the plain negative form of the verb to express that not doing something is better.