We are going to explain what exactly SMACSS is and we are going to go through all the possible SMACSS categories that we could use in our .libraries.yml file.
Here is the codebase of our example:
https://github.com/drupal-up/drupal_up_smacss
The idea is though not just to be another platform with some boring videos but all the videos to be inspired by real-world problems. That means something that you will most probably need if you work with Drupal.
We want you to be successful and we want to teach you everything we know about Drupal!
So watch the videos, try to follow and reproduce, ask questions and you will see you will be able to conquer this wonderful sea that Drupal 8 is.