We've just published a new version of the Office 365 CLI with new commands for working with and managing Office 365 tenants and SharePoint Framework projects on any platform.
Passing the whole web part context into React components might seem convenient at first, but is far from it in the long run.
When working with the Office 365 CLI, you need to connect to SharePoint only once.
When you communicate with SharePoint using its APIs, you have to assume that you might get throttled. Here is how to verify if your application can handle it correctly.
When building SharePoint solutions, you might need to get the URL of the tenant app catalog. Recent changes to the SharePoint API make it very easy.