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.
In cases where taxonomy terms are used only for categorizing content on a Drupal powered web page, there should be no harm in deleting them. However sometimes taxonomy is used to store terms critical to the content they are referenced from and in this case steps should be taken to prevent an accidental deletion.