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In general, we use it for actions that have occurred before another action in the past.
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SUJECT (I, you, he, she, it, we, they), AUXILIARY (had), CONTRACTION (I’d, you’d, he’d, she’d, it’d, we’d, they’d) and PAST PARTICIPLE (studied, visited, worked…)
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Suject + “had” + past participle…
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--> I had visited the Louvre before, so I knew where the Mona Lisa was
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Suject + “had not" + past participle
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--> They had not studied English before they went to London
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“Had not" + Suject + past participle?
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--> Had you ever flown before the trip to France?