DB Doc
Index for DB: https://docs.djangoproject.com/en/2.2/topics/db/
- Making queries:https://docs.djangoproject.com/en/1.11/topics/db/queries/
- Database access optimization - https://docs.djangoproject.com/en/1.11/topics/db/optimization/
- When QuerySets are evaluated - https://docs.djangoproject.com/en/2.2/topics/db/queries/
API Doc
QuerySet API reference:https://docs.djangoproject.com/en/1.11/ref/models/querysets/
Performance and optimization - https://docs.djangoproject.com/en/1.11/topics/performance/