...something that the user knows.
Respiratory system ?. Or esophagus?
Answer:
It is good to know about the differences between margin and padding .Margin is the outer space of an element, while padding is the inner space of an element. In other words, margin is the space outside of an element's border, while padding is the space inside of its border. You can set auto value to margin.
Troy should include a short overview of the story that his video will tell and why he wants to tell it (or what the video will be about and why). It should also include the target audience, and where the video will be published.