The first words you see at https://nextjs.org/learn-pages-router/basics/create-nextjs-app are "New App Router Course: You're currently viewing the Pages Router course. View the new App Router course here." Which makes me think that maybe that tutorial is for an older version of NextJS. Then when you click the link "View the new App Router course here" https://nextjs.org/learn what I see ~ seems as if / appears to be ~ newer -- but that's just my subjective perception of things.

I want to practice with and learn the newest possible version of NextJS. Are there any differences between those two tutorials in terms what version of NextJS is being taught? Is one for an older version and / or less relevant to the latest version?