Confusion on What the Gold Back Standard Means to the US Dollar

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What does a gold-backed dollar mean? Do we lose our money with a gold standard? How does a gold standard replace the dollar? Does Trump know about the gold standard? How does the Gold Standard fix the Federal Reserve? If the price of Gold rises, does the dollar reduce in value? If the value of the dollar decreases, does inflation increase? Who takes over the gold-backed currency, the Treasury or the Fed?