Install Node package manager (npm). It is the tool required to install JavaScript packages and libraries:
sudo apt install npm
Install Node version manager (nvm). Volto frontend requires a Node.js server for resource delivery and server side rendering. Node version manager is a tool which helps running the version of Node.js required by Volto:
wget -qO- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.3/install.sh | bash