# when this command doesn't work:
npm install -g nodemon

# Can try

sudo npm install -g nodemon

#It will then ask you to enter the password you use to log on to your computer.
#So, if you have any problems with this step.
#1. Make sure you are logged in to your computer on an account with admin privileges.
#2. Use sudo in front of the installation command.
#3. Type your password when prompted. Note your password typing will not show. Just hit enter once you've typed it all.