How did 13 Reasons Why change when it was adapted for Netflix?

13 Reasons Why was hugely popular and important YA novel written in 2007 by Jay Asher. In 2017, it received a 13 episode Netflix adaption, which has renewed interest in the story. How did this story change, develop, or grow in its transition to the screen? Were these changes effective, or did they hinder or distinctly change the overall story or characters?

Take us through the changes between the netflix series and the book that inspired it.