I finished the official Next JS learn course and followed the authentication instructions here: https://nextjs.org/learn/dashboard-app/adding-authentication

But I've noticed chatgpt and the authjs dev docs have different setup instructions. One of the main things is that the nextjs course didn't have a app/api/auth/[...nextauth]/route.ts route, but chatGPT and authjs do. Example: https://authjs.dev/getting-started/installation

I know both probably work, but which should I follow and how are these two similar and different? Any tips would be appreciated. Thanks!