New Gutenberg WordPress Editor
With the release of WordPress 4.9.8 comes the option of the new Gutenberg Editor. This makes adding rich content to WordPress much easier and uses ‘blocks’ of content.
It adds many features to the visual editor and reduces he need for tags and coding to get your site how you want it. I think it is a huge step forward for WP and will be opting in to use it on my sites.
Unless you install the classic editor plugin, Gutenberg will become the default editor in the next major WordPress release.
You can try it not, just update your site to 4.9.8 and you will get a notification on your dashboard with the option to install the Gutenberg Editor.