This new release comes with many changes and features, let's see :
- Django 3.0 supports new versions of Python 3.6, 3.7, and 3.8 (the old Django 2.2.x series is the last to support Python 3.5);
- Django now officially supports MariaDB 10.1 and higher;
- Django is fully async-capable by providing support for running as an ASGI application;
- The exclusion class constraints on PostgreSQL;
- the output BooleanField may now be used directly in QuerySet filters;
- you can have custom enumeration types
- cache features: add_never_cache_headers() and never_cache() now add the private directive to Cache-Control headers;
- file storage, forms, internationalization, and logging features;
- the management commands are new options;
- the Requests and Responses, Models and Security has many changes and new features;
- the Tests and test cases have a good implementation;
- new minor features for django.contrib.admin, django.contrib.auth, django.contrib.gis, django.contrib.postgres, django.contrib.sessions, django.contrib.syndication and more