> How do you implement Server Side Rendering or SSR?
Easy, you don't. Don't look up guides, don't try to figure it out yourself, there are so many gotchas that you will never be successful. React on the server is horrible. Yes, even in Next. Don't do it.
> How do you enable production mode in React?
This isn't a React question, it's a bundler question, which is something you do once per project and never touch again until it breaks. Why are we asking this?