I am new to Shopify.
I followed the tutorial of "Build a Shopify App with Node and React ". It seems all right https://shopify.dev/tutorials/build-a-shopify-app-with-node-and-react/set-up-your-app#run-your-proje...
"npm run dev" is successful and shows "event - compiled successfully" but when I tried http://localhost:3000. It showed 404.
Hope somebody can help me. Thanks~