Gutenberg is expected to ship in WordPress 5.0 sometime in April 2018 (as per Matt's estimate). If you are a WordPress user and have WordPress websites you should start exploring Gutenberg today. Even though you will be able to disable Gutenberg with a plugin, but that won't benefit you in the long run.
Gutenberg will be included in WordPress core as a default editor. Almost every other plugin and theme developers out there will do best to make their plugins & theme compatible with Gutenberg. And you will see a ton of awesome new Gutenberg addon plugins & themes in the near future which you will wish to use. So ultimately you will have to use Gutenberg (WP default editor) sometime later.
Concerns about Gutenberg & WordPress 5.0
Now I know you may have a lot of concerns about what happens when the Gutenberg will ship with WordPress 5.0. Such as:
- What If I wish to use the old editor?
- Will Gutenberg break my WordPress website?
- Will Gutenberg support meta boxes such as ACF, etc?
- Will Gutenberg work with my custom post type?
- Will Shortcodes work with Gutenberg?
- Will Gutenberg work with my theme?
- Is Gutenberg a page builder?
- and more…
Fortunately, there is a great piece of article by TinyMCE, discussing all those concerns. I must suggest you read through this post here to find out answers to your concerns. I know that is not official, but very logical and authentic.
Official Gutenberg User Guides & Resources
I am not aware really of an official guide on how to use Gutenberg at the moment. The only official resource you may follow is the Make WordPress Core blog. I will make sure to update this if any official Gutenberg guide/resource comes out.
Gutenberg Tutorials & Courses for Users
- An Introduction to Gutenberg Course by Joe Casabona. ( paid course )
- Gutenberg User Interface Exploration by Tammie Lister ( one of the core team member)
- Diving into Gutenberg WordPress editor by Kinsta.
- How to build your next website with Gutenberg by CodeInWP.
If you know of any other good resource to help WordPress users Please tell us about it @gutenberghub on twitter.