Here are some examples:
* "I'm struggling to carry these boxes. Could you give me a hand?"
* "I'm really busy with work, so I'd appreciate it if you could give me a hand with the presentation."
* "She gave him a hand with his homework."
The idiom emphasizes the physical act of helping, like lending a hand to lift something heavy. However, it's often used in a broader sense to refer to any kind of assistance, even if it doesn't involve physically touching something.