How can I manage multiple versions of Node.js on my machine using nvm?

First things first, ensure that nvm is installed on your machine with `nvm install`. To use a specific version of Node.js, type the command `nvm use 8.10.0`, taking 8.10.0 as an example. Finally, to set default versions of Node.js for different projects, I'd suggest using `nvm alias`. That being said, you can also consider creating a `.nvmrc` file in your project directory to specify the required Node.js version, which would ensure project-specific version management.