I've been "playing with" (using - but not in a work sense) Drupal on-and-off for over 12+ years. I've installed it many many times and played with the various commonly used modules, but rarely doing much with it. Aspirations, mainly. Drupal 6 was probably the version if got most used to (and, as of December 2018, still have a tiny long-standing site still running it). Since 2014 I've managed a Drupal 7 site which was an evolution, but managed much the same way -- uploading files from the release zip to the hosting provider, trying to remember any library dependancies.