Answer 1

NestJS is a server side framework, just like Express, Koa, Hapi, etc.

The only way that NestJS "supports" Angular is that it follows a similar architecture pattern and you can use the ng builder instead of the typescript compiler.

There's a segment in the documentation called Model-View-Controller that describes how to use a templating language (like Handlebars) with the framework.

The whole point of a server is to be front-end agnostic.

So in short you can use Nextjs do work with React as far as I know..