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Please explain the difference between using can and could. Please give me some different scenario of can and could in sentences. Thank you!
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I remember this from a while back, it's a similar problem:

When to use "can" and "could", "will" and "would"

Can you get that for me? = Could you get that for me? (although it can refer to a moment in the past)
Can you help? = Could you help? (although it can refer to a moment in the past)

Can you see that? - Present
Could you see that? - Past

Can you reach it? = Present
Could you reach it? = Past