5 lessons
Why NoSQL exists - the limits of the relational model
CAP theorem, horizontal scaling, and the real problems that pushed some systems away from strict relational tables.
The four types of NoSQL databases
Document, key-value, column-family and graph databases explained one at a time - what each is actually good at, with real examples.
MongoDB hands-on: your first document database
Installing MongoDB, the document model in practice, queries and aggregation compared directly against SQL you already know.
Redis hands-on: caching and beyond
Installing Redis, its core data structures, and the caching pattern behind almost every fast, high-traffic application.
Choosing the right database: a complete decision framework
A capstone lesson bringing together every database in this course into one practical framework, plus a worked real-world example.