Learning Resource for Theming with Drupal 8

Learning Resource for Theming with Drupal 8

Can anyone suggest a good, up to date, resource for learning theming with Drupal 8?

I’ve tried a book but it’s about a year old and comes with databases to load onto drupal and I’m having so many difficulties working around problems and system crashes, possibly arising from incompatibility with the current version of drupal, that I’m spending all my time doing that rather than learning theming.

A lot of tutorials are quite old.

Any suggestions appreciated.

Drupal version: 


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