Apparently there are still pretty common Drupal 8 theming tasks that cannot be accomplished with the great twig_tweak module. This by the way was me giving a plug to a great little module, which makes half of all your theme preprocess hooks unnecessary.
Creating a duplicate of an entity is easily done via the entity API method Entity::createDuplicate(). This is a convenient method if the goal is to clone an entity into a new entity, as all identifiers of the previous entity get unset when using this method.
Drush should be installed and updated through composer. There is no stable Drush 9 version yet, so the development version must be used. Updating to the development version of Drush 9 is a simple as typing:
$ composer require drush/drush:dev-masterPorting the commands is a semi-automatic process: There is a command that will generate the required files and class structure for you. To start the wizard, just type:
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If you need a simple Views display switch to toggle e.g between a list and a grid display of a view, there are a couple of plug & play options already.