Please do not take this as being rude, because I am glad we are having a discussion here. But never use youtube as a source. Unfortunately, some people, like the ones who created the video, learn a little bit about some things, and then think they are authorities.
When I talk about the value of money, and supply & demand, I am talking about currency. Most nations have a floating currency. Some have others, but I am not going to get into that right now. The more that currency is used without printing any addition dollars, the more it is worth. So take the American dollar. The American dollar was higher than it is now, because many nations used it and much of the world business is done in American dollars. It has been decreasing in value, because the US market is not as well used.
Printing money devalues it. It increases inflation. After World War I, the Germans tried to print money to pay for its reparations. All it did was devalued the currency and people then needed grocery bags of money to pay for bread.
Now, the idea that the value of currency holds people down and keeps the poor poor, is not accurate. The poor are poor not because the value of currency. You can change that value and the poor will still be poor and the rich will still be rich. The difference in wealth are not due to a value on a bill, but instead in assets. Essentially, the rich just have more. If you printed more money and gave it to the poor, it would just devalue the dollar and they would need more dollars to buy the same things that they did before. Pretty much, if it now costs $1 for a litre of milk, you print more money and the poor may have twice as much, but now the milk is $2 for a litre.
Canada did not eliminate its deficit. It lowered it. It lowered it by raising taxes, not lowering them in good times, cutting spending. Then, when things were good, it was able to increase spending and lower taxes. Government has mainly two sources of revenue, 1) taxes, 2) loans. When it cannot pay for its budget with the current taxes, it must borrow to make up the short fall. It could print money to do it, but since it creates inflation, you really are not going to be able to pay for anything on it.