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You can damage the plant if you water leaves in bright sunshine, because water will act as a lens and leaves will get burned. Otherwise I'd follow nature: plants get water when it rains, so leaves should have some water too.

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Watering at nightfall when the ambient temperature is below 70F is a recipe for rot as well.

When it's cold, you water in the morning. When it's hot, you water at night.

I didn't know thank you.

Depending on the species it may make sense to raise the humidity in the air (that's especially valid for indoor plants or tropical plants in greenhouses, hence misting). But watering the leaves is not needed and is pretty much useless to the plant. In nature of course plants get wet under the rain but, as mentioned, this helps diseases (moulds, mildew, virii, etc) take hold so in general it's best avoided if at all possible.

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