The easiest way to deploy Next.js to production is to use the Vercel platform from the creators of Next.js. Vercel is an all-in-one platform with Global CDN supporting static & JAMStack deployment and Serverless Functions. To read more details, please Click Here.
https://www.digitalocean.com/community/tutorials/how-to-deploy-a-next-js-app-to-app-platform
https://www.netlify.com/with/nextjs/
https://scotch.io/tutorials/easily-deploy-a-fullstack-nextjs-app-with-vercel