Include third-party library I have a third party library located in the root/libraries directory, but it is not called on my webpage. I was wondering using subtheme/subtheme.theme or subtheme.libraries.yml. I call it from here? Any information would be great, I can't find documentation on third party libraries for Drupal 8.
You can add your library in your file theme.libraries.yml (or module.libraries.yml) like this:

# Parsley use for contact_form.
parsley:
  js:
    dist/js/vendors/parsley.min.js: { minified: true }
  dependencies:
    - core/jquery


After, you can include your library like any other libraries with a hook or a template.