Below is a list of warnings when migrating from Bootstrap 3/django-bootstrap3 to Bootstrap 4/django-bootstrap4.
This document only considers the differences between django-bootstrap3 and django-bootstrap4. For the migration guide from Bootstrap 3 to 4, please look at the Bootstrap docs, especially the Migration section.
Bootstrap 4 does not ship with an icon set, so everything regarding icons has been removed.
If you need easy access to icons that are compatible with Bootstrap 4, please consider using django-icons.