Next, type in the following command to start the Yeoman SharePoint generator:
yo @microsoft/sharepoint
Click Enter to accept the solution name to be helloworld-webpart (based on the folder we are in), and again to accept the current folder to hold the files. For the framework selection, select No JavaScript web framework. Accept HelloWorld as the web part name and HelloWorld description as web part description.
Yeoman will now scaffold the file structure for your project, and this typically takes several seconds. Then Yeoman will resolve dependencies within your project and this process typically takes several minutes:
Looks good with the ASCII art SharePoint logo and everything.