The excellent ScreenCastsOnline tutorial site has created a great, extended Drafts 5 tutorial screencast.
The tutorial is over an hour long and is a great way to get started with Drafts. It covers installation, initial setup, common use cases like tweeting and creating tasks and gets started with configuring more advanced features. It’s a great introduction to Drafts!
ScreenCastsOnline is a membership service. They produce a lot of great content, if you are interested in their membership - you can also access the video a free trials, or as individual purchase in their SCO Showcase app.