My first upgrade to WordPress 5.0 killed my site. Good thing my host has backups. So I made a staging site and tested everything to make sure that it won't happen again, then pushed the changes to the live site. Fiddled around Gutenberg. Turns out it adds a bunch of useless code to new posts. The new editor is just unnecessary IMO.

I installed Classic Editor and will be using it until it won't be supported anymore.