Drupal console brings scaffolding to the Drupal ecosystem and makes it easy to generate a content entity.
In most instances you will find it easier to work with a custom entity within a custom module.
vendor/bin/drupal generate:module
Follow the prompts and create your custom module.
vendor/bin/drupal generate:entity:content
Follow the prompts on your commandline making sure to select the custom module created in the previous step.