We've just published a new version of the Office 365 CLI with commands for managing Office 365 tenants and SharePoint Framework projects on any platform.
In case you wonder which version of the SharePoint Framework you're using, here is how you can check it.
What version of the SharePoint Framework should you use for your project? 'The latest' seems an easy answer, but there is more to it.
While SharePoint Framework has been around for a while now, it could be that you're just starting with it. Here is the easiest way to get going.