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First download node.js: https://nodejs.org/dist/v7.3.0/node-v7.3.0-linux-x64.tar.gz
Then go to the download folder and unpack node.js.
tar –xzvf node-v7.3.0-linux-x64.tar.gz
Now we have to create a new folder for node.js.
mkdir /usr/local/node
Then we move all to the new folder.
mv node-v7.3.0-linux-x64/* /usr/local/node
At last we go to the root folder with cd and add the path of node.js.
export PATH=$PATH:/usr/local/node/bin
With echo $PATH we can see the paths.