Answer 1

When to use Nodejs? 🤔

When you need a web hosting to host your website,
or when you need to develop a system program,
or when you need to develop a desktop program.
or when you need to develop cross platform mobile apps.
or when you need to do system automation,
or when you need to compile sass, css preprocessor,
or when you need to minify js files,
or when you need a localhost for testing.
or when you need to deploy a website
or.....

Basically Node js could build all kind of applications.