Times like this, why can't we just print more money?

Some already know, some don't. My dad answered same question before but I didn't fully understood until today.

If we print more money, people will have more money to buy goods and the market will not be able to keep up with the demand therefore, prices will go sky high that even amount of money you have will not be sufficient enough to afford the prices. Therefore your money would be worthless. Farmers will refuse to bring their produce to the city in return of worthless money.
If this happens, the economic state by then would be a nightmare.

Many learned from the hyperinflation happened to Germany in 1923. We don't want to repeat history.

Source: http://www.usagold.com/germannightmare.html

In times like this, what do you do to save money?