Explanation: A physical task is usually done with the hands. Giving someone a hand is letting them borrow your hands, or in other words, helping them out.
"Give a hand" also represent applauding, but this section is about helping someone.
Can you give me a hand setting up the dining table?
I'm going to need a hand changing the tire on the car.
Are you going to have time to give me a hand tomorrow?
Let me know if you need help. I'll have time all day today to give you a hand.
A:
When are you going to move into your new apartment?
B:
I want to, but I'm going to need some help.
A:
I have time this weekend. Do you want me to give you a hand?