npm not installing on centos 7 code example

Example 1: yum install node

curl -sL https://rpm.nodesource.com/setup_10.x | sudo bash -
sudo yum install nodejs

Example 2: How to install npm in centos

curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.35.3/install.sh | bash
source ~/.bash_profile
nvm list-remote

Example 3: install node.js centos

curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.35.3/install.sh | bash