This post teaches you the npm basics from a Visual Studio perspective. NET libraries from Nuget, but get your web frameworks from npm.
Likely, though, you understand there is a much bigger web development world outside of ASP.NET and Visual Studio – and this world uses npm. If you are a Visual Studio developer using Nuget through the years, this may be news to you. The defacto package manager for JavaScript frameworks and tooling has become npm (node package manager).