[ابو بيشو]

If people want to be healthy, they had better be more careful
about what they eat.
If people want to be healthy, they should be more careful
about what they eat.
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Had better is used in informal styles when you give someone strong
advice about what to do in a particular situation. The situation usually
exists at the moment of speaking and so there is usually a sense of
urgency in the advice: 'You'd better hurry or you'll miss the bus.' 'You'd
better ring your parents -just in case they're worrying about you.'
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To give advice on a general situation or to say that one course of action
is better than another one, use should, ought to or it would be better
to: 'Parents should teach their children to be kind to animals.' 'Rather
than complain and risk upsetting her, it would be better to say nothing