You can visit their website and install it using an installer. If you're on MacOS or on a variant of Linux, your best bet is using your package manager.
I prefer to use the node version manager or nvm. This way, if you are working on projects that vary in NodeJs versions, you can simply switch using the nvm command.
This one is probably the most straightforward approach. You can go to their downloads page (https://nodejs.org/en/download/) and click on a version you want. This is probably the easier on Windows machines that are not using any package managers.
See here.
My preferred way of using NodeJs is via the Node Version Manager (nvm), which obviously manages different versions of NodeJs. This can be very helpful if you're working with other projects that use a different version of NodeJs.
Here, I am on Windows using the Chocolatey package manager to install nvm. Be sure to run your shell (if on Windows) with administrator privileges or you will not be able to install anything.
You can view a list of NodeJs released versions here.
For this guide, I'm going to install version 14.5.0. Installing a certain version of NodeJs will also install the Node Package Manager software (npm) that comes with that version of NodeJs.
Install it using the command
$ nvm install 14.5.0
And then tell nvm to use that version
$ nvm use 14.5.0
If you can type
$ node -v
$ npm -v
and have it return your versions, then you have successfully installed NodeJs.
