Having done a lot of MongoDB at work in the past few months, I decided to take the MongoDB University courses. I wanted to understand MongoDB better from both a developer, database administrator and infrastructure engineer perspective, so I ended up taking all three courses available:

• M101P: MongoDB for Developers (my certificate of completion)
• M102: MongoDB for DBAs (my certificate of completion)
• M202: MongoDB Advanced Deployment and Operations (my certificate of completion)

My favourite course was by far M202, which is very hands on and contains a lot of exercises that covers topics such as restoring a cluster with corrupt nodes and optimising sharded clusters.