You are reading the right document if you install packages with npm, e.g.:
npm i -g unicorns
and after typing
unicorns -v, you get
unicorns: command not found.
sudo chown -R $USER /usr/local should solve the problem.
Make sure your prefix is
/usr/local, (you can check it with
npm config get prefix).
If not, you can set it with
npm config set prefix /usr/local
If above method doesn’t work, set $HOME as npm’s root directory with below commands:
npm config set prefix=$HOME/node nano ~/.bash_profile export PATH=$HOME/node/bin:$PATH source ~/.bash_profile