What does secondary mean?

Many history classes learn by using textbooks. What kind of source would that be?

If someone interviewed Martin Luther King Jr. about his work during the Civil Rights Movement, would that be a primary or secondary source?

Your teacher is giving a lecture about the French Revolution, which happened in the late 1700s. Is your teacher's lecture a primary or secondary source?

If Mr. Jarvis wrote a book about Harriet Tubman and all of her great accomplishments, would that be a secondary or primary source?

If Mr. Jarvis wrote a book about his life growing up in Wilkes County, would that be a primary or secondary source?

You are shown this image during a lesson about the first black president, Barack Obama. Is this picture a primary or secondary source?

You watch the musical Hamilton on Disney+ about the life of Alexander Hamilton, who was one of the United State's founding fathers. Is the musical a primary or secondary source?

The teacher hands every student a copy of the Declaration of Independence. Is this copy a primary or secondary source?

What kind of source is the best to use when doing historical research?

If Kobe Bryant's family released a diary he had kept during his playing days, what kind of source would that diary be?