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Formatting a duration

When a command requires a duration parameter, you format it as a number followed by a unit. The unit can be one of the following:
  • s for seconds.
  • m for minutes.
  • h for hours.
  • d for days.
For example, 1h represents one hour, and 1d represents one day. You can also combine units, for example, 3d1h represents three days and one hour.

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Flags

When a command supports flags, you can use them to modify the command’s behavior. Flags are mostly optional and can be used to specify additional options. For example, if a command supports a --audio flag, you can use it like this: 
-download https://youtu.be/dQw4w9WgXcQ --audio
Some flags can be used with a value, like --quality: 
-download https://youtu.be/dQw4w9WgXcQ --quality 1080
You can also chain flags together, like this: 
-download https://youtu.be/dQw4w9WgXcQ --audio --quality 1080