WordPress 5.0 just landed with a new post and page editor called Gutenberg.
Because WordPress 5.0 is a major version release, you’ll want to have a proper update checklist in place so the update goes smoothly.
In this post, we cover how to update to WordPress 5.0 with a quick checklist. Most sites should update with little or no issues.
— Read on ithemes.com/2018/12/06/how-to-update-to-wordpress-5-0/