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How to do it...

Open your command-line application.
Clone the nvm project into a directory in your home folder:

git clone https://github.com/creationix/nvm.git ~/.nvm

Add the following code to the bottom of your ~/.bashrc or ~/.zshrc file. If you don't know what shell you are running, it is probably bash and you should add the entry to ~/.bashrc:

# Configure NVM 
export NVM_DIR="$HOME/.nvm" 
[ -s "$NVM_DIR/nvm.sh" ] && . "$NVM_DIR/nvm.sh" 
[ -s "$NVM_DIR/bash_completion" ] && . "$NVM_DIR/bash_completion"

Save the file and return to your command line:

source ~/.bashrc # (or ~/.zshrc if you're running zshell)

Confirm your installation by checking the version number of nvm:

> nvm --version
0.33.5

List all of the node versions available for installation:

> nvm list-remote

Install the latest Long Term Support (LTS) or stable version. (At the time of writing, version 8.9.4 is the latest LTS version):

    > nvm install 8.9.4

Confirm the installation of node and npm by checking their version numbers:

    >  node --version
    v8.9.4
    > npm --version
    5.6.0