#1 why is knowing the difference between a primary source and a secondary source important?
#2 why would charlie puth's autobiography be considered a primary source and not a secondary source?

The difference between a primary source and a secondary source is that a primary source is most likely going to be more reliable because it came from someone or something that was there when it happened.

Charlie Puth’s autobiography would be a primary source because he is the one writing it. If someone else were to write it they wouldn’t know everything which could change the way that it was written.

It might be the second one