About 18 months ago, I took the M101JS MongoDB for Node.js Developers. You can attend this kind of courses on university.mongodb.com (they launch a session about every three months).
This time, I decided to attend the M102: MongoDB for DBAs and successfully completed.
In this course, you’ll learn about replication, scalability, backups (where the 101 course was more about query optimisation, indexes …).
I’m not a DBA, nor I pretend to be or become one, but I’ve been working in web development for some time now and always been working with databases. All the topics addressed are worth knowing if you ever have scalability in your applications (whether it’s at the DB layer or elsewhere).
Here is a link to the notes I took from the course (it’s a github repo, you can contribute).