WordPress 5.0 Will NOT Break Your Website
I've seen some misinformation on the internet with people fearing that the upcoming major update to WordPress will break people's websites. This is not the case.
Even after the change to the blocks editor your site will look and work exactly as it does now. The difference will only be in the way that you create new content and edit the old stuff.
As you know, WordPress converts your new content to static HTML. The HTML for your old content will not be changed when WordPress updates to the blocks editor, it will only affect new content. So your old content will remain exactly the same. Your website is not about to break.
Install the Classic Editor plugin
If you are not ready for the change then install the classic editor plugin which is available from your WordPress dashboard. This is what is recommended by WordPress.org.
You can even use the new blocks editor in conjunction with the classic editor plugin
As always, create a backup of your website and save it on your computer before you update WordPress. Major changes to the version number such as updating from version 4.x.x to version 5.0 are not automatic so you have time to create your backup before updating.
If you have any questions please add to the discussion below.
As always, I'm here to help you.