Commodities represent real value. That value remains essentially unchanged over time. A bag of wheat is worth what a bag of wheat is worth... except when someone really wants to bake some bread. Then, that person will pay more for the bag. That's called market fluctuation.
Gold and silver are the same sort of commodity--from a monetary perspective--as wheat. They have actual, essentially unchanging value. The dollar on the other hand is currency by fiat. That means it has value because the government says it has value. In reality, a dollar is simply a piece of fairly good quality paper with essentially no real value--like an expired coupon. However, because we have all agreed to exchange these bits of paper for real goods and services, those bits of paper do have an accepted value.
But that value is diminishing, day by day.
Look at real products like oats, corn, petroleum, steel and the like. In the past two years, the cost (in dollars) of these items has increased by something around 80%. That is not because these items are in short supply or because they are actually worth more, but rather because the dollar is worth less. That called inflation
In the short term, gold and silver will appear to fluctuate against the dollar, so these items are not for the faint hearted investor who still thinks in terms of valuable dollars. In the longer term, it will take more and more dollars to purchase them, so the perception of value will be increased as a direct result of a devalued dollar.
The dollar has diminishing value--that is a simple fact. As a government, or society, or civilization, we cannot stop that--that is also a simple fact. It is currency by fiat, or money because we say it is money. But the FED is printing the stuff by the truckload and that makes every existing dollar worth less today than it was yesterday. That is called inflation. And at this point, it can only get worse.
Gold and silver represent real value because they are real, lasting, and in limited supply. We can't print gold or silver.
If you need some walking around money, sell small amounts of your hoard of gold or silver. Then, buy .22 LR cartridges by the caseload. And stock up on beans and rice and rice and beans. I believe we will live to see the day of hyper-inflation when the dollar has about the same value as a Reichsmark after Hitler's fall. It'll take a wheelbarrow full to buy a loaf of bread.
Or, you can move to la-la land and room with the Quaker and ride your unicorn to the gin-filled lake lined with sandwich trees and roast beef bushes.