Config at root

Settings split

Settings inheritance

Apps directory

App file structure

PostgreSQL engine

Environment variable usage

Whitenoise and CORS middleware

DRF in INSTALLED_APPS

Production security settings

HSTS subdomains and preload

Debug=False in production

Debug=True in development

AbstractUser extension

Email as USERNAME_FIELD

Model Meta attributes

SlugField configuration

Auto-slug in save()

CheckConstraint for price

Composite indexes

Custom QuerySet with as_manager()

select_related in QuerySet

prefetch_related in QuerySet

Service layer file

Atomic transaction

Password write-only

Password hashing in create()

Password confirm pop

Field-level validation

SerializerMethodField

get_serializer_class override

Filter backends

Featured @action

Low-level cache pattern

Signal with @receiver

Signals in AppConfig.ready()

default_auto_field in AppConfig