This is a course about NoSQL by Big Data University. It's a free course, but with very valuable information about the history of NoSQL databases, the classification of these databases, as well as the recomended uses and the not so recomended uses for each kind of database. Another part of the course is the notion of Database as a service, DBaaS, and the service offer by IBM, Cloudera.
It is possible to open a free account in Cloudera to make some tests and continue to expand your knowledge about the subject. Another important thing to remember is that the majority of these databases are available as Open Source solutions, so is it possible to experiment with these databases for learning and working at free cost.
The teacher is good, but it's better to have the transcription at hand, because there is too much new terminology that could be unknown to the novice.
Link to the course : https://bigdatauniversity.com/courses/introduction-nosql-dbaas/
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