In my English course I've learned that 'can' is the verb in present and 'could' the verb + would, so... you can use it how you prefer. My teacher had said to me that was more common use 'could' to ask favors.
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AnonymousCan you explain it to me better? or Could you explain it to me better?could is better when making a request, because it's a little more polite, but can is not wrong.