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Money is not a thing. It only represents the value of other things.
Say I grow potatoes and you grow cabbages. We want some of each other's crop. Great - we can do a swap and agree a price, say 2 potatoes for one cabbage. But what if I need a sweater and the knitter who made it only wants cabbages? We could do a three-way swap. But you can see this is going to get EXTREMELY complicated once you start thinking about all the hundreds of different things there are to buy.
So money was invented. If everything was priced in dollars, then I can swap my potatoes for dollars, and use those dollars to swap for anything else I want. It cuts through the problem of finding the right people to do a swap with. Of course that's what we actually do.
If the government then goes and prints millions more dollars, I'm thinking "there are more dollars around, I can charge more for each of my potatoes". You're thinking the same about your cabbages. And that's what happens in real life too - with more dollars around but only the same amount of stuff to buy with them, prices go up until supply and demand balance again, with everything at a new higher price.
So printing more money never solves anything. Governments that have actually done this only cause inflation. There are many examples in history, Germany in 1923, Zimbabwe in recent years to name just two.
Let's take Zimbabwe. President Mugabe kicked white people off their farms and gave them to blacks. They didn't know how to farm so efficiently. There was less food in the stores and the price went up to balance the money available to buy it, because people are prepared to pay more for something scarce. The government printed more money so people could afford more food, and all that happened was prices shot up again. The government printed even more to compensate for rising prices, and prices shot up even more. The result was everyone was a trillionaire but THERE'S STILL NO FOOD! The Zimbabwean dollar is now totally worthless.
And THAT'S why sensible governments don't do it.