where are you going to host the site?

You can self-host Next.js in three different ways:

A Node.js server
A Docker container
A static export

I build a nft staking app on polygon. using thirdweb.app runs on localhost:3000 but when I build it all the contents go to /.next folder.not simple dist/out folder. We have the domain but don't know what to put in the domain folder as contents are scattered in next folder.

if you are looking for static export, add this to next.config.js

output: "export"

after you run build, there will be a out folder

Will I be able to interact with the polygon explorer through this?

As users will interact as well

wdym?

As this is a staking app.as I will deploy it on domain.our users will connect their meta mask wallet and stake NFTs and earn crypto token

check unsupported feature

if you site doesn't use one of these, it should be fine

otherwise, you need to host the site with nodejs

I think you can test it with
npm run build
npx serve out

I'll check this and will tell.