Good Resources for Learning NextJS?

I've been exploring web development, particularly for building web frontends for some products, and that got me hooked to React, and consequently NextJS. But as with all things Javascript, there don't seem to be any good resources out there, leaving me completely lost with React and NextJS. Are there any good resources you guys would suggest for taking up the framework?

For one, it always seems to be a challenge for me to continue building upon React products. While I could easily flesh out an app solution using Flutter or Swift after learning those two languages, I am not able to create even basic stuff after doing n tutorials with React and NextJS, even though I have done a few pretty okay tutorials from Vercel and the like. I feel it's because those tutorials seem less about learning NextJS/React concepts and more about building the target product.