FAQ Block is a block for Gutenberg. With it, you will be able to create a Frequently Asked Questions page on your website very easily. Simply add a block for each question and you are done.
I am not sure if it’s currently a bug in Gutenberg: this block requires an input in the generated HTML but for some reason, Gutenberg removes it from the DOM while saving. This issue only happens for author/editors, but not for admins (which is even more weird).