Does the National Debt have to be Repaid?

This video is a complete walkthrough of the problem of national debt, answering following questions:
1) Does the national debt have to be repaid?
2) What are the consequences of debt accumulation?
3) Why there haven't been many debt related economic collapses so far?
4) What is the debt spiral?
5) Can the government just print the money to pay for the debt?
6) What if the government decided to just not pay the debt?

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Timestamps:
00:00 - Intro
00:40 - Debt repayment
01:16 - Problem 1
02:34 - Problem 2
04:32 - Lack of collapses so far
05-37 - Debt spiral
07:53 - Debt money printing
11:30 - Not paying the debt