The modal verb should expresses weaker obligation than must and have to.
|Should - to express obligation|
Structure: should + infinitive form of a verb:
should be, should go, should do, etc.
We use should for the present and the future.
We use should to give advice to someone and to say that something is a good idea.
Should is weaker than have to and must.
You should tell them the truth.
You shouldn't smoke, it's bad for you.
I don't think you should do it.