Should-ought to-had better

Should and ought to have the same meaning. They are used to give advice, or say what is the right thing to do; for examples:
You should  call your friend to thank her. 
You should go to the doctor's
We should stop misbehaving

Ought to is less frequently used and is more formal.
Ought to is not usually used in questions or negative statements

Should I open the window?
You shouldn't tell lies
You shouldn't talk so much during the classes
(You oughtn't tell lies)

Had better (or 'd better) has also the same meaning, but it's stronger. It implies a warning or threat of possible bad consequences; There's a danger or a problem if we don't follow the advice. For examples, 

It's raining; you'd better take your umbrella. 
I have a very important meeting at 8; I had better not be late!
I'd better study for the test!
I'd better not hang out with my friends today


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