This is what we found on Wikipedia regarding the Avatar - The Last Airbender:

The Avatar: The Last Airbender comics are an official continuation of the original Nickelodeon animated television series, Avatar: The Last Airbender, created by Michael Dante DiMartino and Bryan Konietzko. The series includes The Lost Adventures, published from 2005 to 2011 and set between episodes of the original series, and the graphic novel trilogies, published since 2012 and set a few years after the original series. A related comic continuation, taking place seven decades later, The Legend of Korra, began publication in 2017.