Salesforce CLI Setup Guide

Quick Start
System Requirements
Move from sfdx (v7) to sf (v2)
Install Salesforce CLI
Update Salesforce CLI
Salesforce CLI Configuration and Tips
Uninstall Salesforce CLI or Plugins
Run Salesforce CLI Using a Docker Image
Salesforce CLI Plugins
Troubleshoot Salesforce CLI
Check Our GitHub Repository for Issues and Discussions
Use the Doctor to Troubleshoot Problems
Debug Errors When Deploying or Retrieving Source
Error: Bad CPU Type
Where is Salesforce CLI Installed?
Error: Command Failed with ENOENT
Error After Installing Salesforce CLI on PowerShell Using npm
Error Installing on Windows About the PATH Not Updated
CLI Deprecation Policy
Next Steps
Release Notes
PDF

Error: Command Failed with ENOENT

After recently installing Salesforce CLI, you get this error when you run a command such as project generate.
1ERROR running project generate:  Command failed with ENOENT: npm root -g --prefix /Users/johndoe/Documents/sf_workspaces/.yo-repository --loglevel error
2spawnSync npm ENOENT

Answer: Install Node.js.