Its probably possible to make small apps but the more prudent question IMO is why would you??

If you want to build anything reasonably large and complex you are probably gonna need to learn React tho

I have been watching Nextjs doc and It seems different from reactjs structure.

you must have a basic knowledge of react before starting nextjs
but you don't need to learn create-react-app (which is not react) or react-router before starting nextjs

i have basic knowledge but I have not advanced knowledge about react! and I want to limit my knowledge to learn everything. I want to apply business logic in nextjs api and fetch data to nextjs frontend. I wish there are builtin state management in nextjs. But mostly I wanna do backend focus application.

if you already know how to write jsx, what basic hooks are, how react renders the page, then i think it's already enough

time to learn nextjs