Questions about Past Perfect tense

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Verb Forms and Their Usage

What is meant by "present perfect", "past perfect", and "future perfect" verbs? How can I identify them or know which is which?
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What does “had had” mean? How does this differ from “had”?

For example, what is the difference between the following two sentences: I had a bad day I had had a bad day
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Why do people sometimes use the past perfect form of a verb when the past would suffice? (e.g. “you had mentioned”)

I noticed that my American friends tend to use the past perfect form when they use the verb mention in its past form, almost despite of the context of the sentence. I hear them say "you had ...