give
In Italian, 'dare' is a verb that translates to 'give' in English. It mainly conveys the action of giving something to somebody else. Like in English, it can be used in a variety of contexts, such as giving a gift to a friend (dare un regalo a un amico) or giving someone a tip (dare un consiglio a qualcuno).
Can I give a hand?
This is an idiomatic expression that means 'Can I help?'. The word 'dare' is used in a metaphorical context to imply help, similar to English usage.
You have to give your best.
This is an exhortation to make the best use of one's abilities. The verb 'dare' is used to convey the sense of offering or putting forward something, in this case one's best effort.
I don't want to take anything for granted.
Used to express a desire not to presume or assume anything. 'Dare per scontato' is a idiomatic phrase that translates literally as 'give for discounted', but the actual meaning is to take something for granted or to assume.