Awesome, I'm a frequent visitor to most of the above resources and also highly recommend them.
I would also love to hear more recommendations that are not specifically Shiny resources (ie. w3schools). Possibly resources that come from similar reactive programming tools. Or another recommendation is of course to use git/github.
Do you write Shiny apps for youself, for customers, for your company/boss? Are there tools/resources that help you or a team develop applications?