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How you can create own theme on Drupal 8

Drupal: 
Difficulty level: 

The most stable theme for Drupal 8 at this time is Bartik. Site works fine with Bartik, although it is possible to improve its appearance and optimize it deleting unnecessary files and scripts. But it is not a good idea to edit Bartik and other core files, this is why you need to copy it and create a new theme.

Clone of Bartik for Drupal 8 is Thisis, download here: https://www.drupal.org/sandbox/tlito/2611000

How to create own theme by copying Bartik: