Entityblock

This module is a successor of the nodeblock module for Drupal 8.

This module allows you to specify content type(s), users, or any other type of entity as being a block. This allows the content managers of the site to edit the block text and title without having to access the block administration page. Users only need edit access to that entity in order to edit it.

Options include changing the block title and selecting a view mode of the entity to use for the block display. So you can show any field of the entity in the created block.

It is very handy to create a simple block content type and enable this content type for blocks and use these in place of the normal 'add block' functionality.