Cassandra is an open-source NoSQL database and I'm sure you've heard of it if you follow the world of data. If you work or plan to work in the Big Data space it wouldn't be a bad idea to learn Cassandra. DataStax developers have webinars every week or so. They go through training exercises on different Cassandra techniques, plugins, etc. If you attend any of their webinars they will send you a free voucher to take either the Cassandra Admin or Cassandra Developer certification test. When I received the voucher I took the Cassandra Developer certification. After about a week and a half of training, I was able to pass the Cassandra Developer Certification.
**Note you do need to attend the entire webinar, you also may be able to win some Swag!**
Datastax has a webinar coming up on April 7th: https://www.eventbrite.com/e/cloud-native-workshop-from-sql-to-nosql-a-migration-path-tickets-148356102095?aff=ebdsoporgprofile
Cassandra: https://cassandra.apache.org/
Datastax Training: https://datastaxacademy.myabsorb.com/#/login
More Cassandra Training: https://www.tutorialspoint.com/cassandra/index.htm
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