Tutorials might be nice, but the library is evolving fast. I'm happier the core team spent time working on an animations API and debugging (including time travel) since the last release instead of working on guides for beginners.
Maybe that changes after 1.0.
Until then, countless users have learned to use it. Also iced is more a library than a framework. There's no right answer to the problems you'll be trying to solve, so writing guides on "best practices" is generally unhelpful if not downright harmful.