One of the things I wanted to do is, have my formatted source code inside the blog articles styled in a different way. To support the community and Drupal9 fancy new things, I used the 'Olivero' theme originally. Now I had to create a sub-theme to be able to change things. Drush to the rescue!
lando drush generate theme
Creates all the folders and files needed. Don't forget to rebuild the cache with:
lando drush cr