Drupal 6 to 8


Ive never worked with Drupal. One of my clients needed an urgent upgrade of their website to the newer D8. Its currently at Drupal 6 but Im struggling to find any forums telling me how to upgrade it to the newest version of Drupal. Can anyone please tell me with steps on how to do it and exactly how to or refer me to a forum that can tell me that please. even updating to to 7 and then 8

Drupal version: 

Source: https://www.drupal.org/taxonomy/term/21/feed