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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
I'm currently having a friend go through Odin Project so they can learn. It seems to be pretty good so far. Might be worth checking out. Although you will notice it teaches web dev, javascript, ruby but the things it teaches are transferable to other languages. https://www.theodinproject.com/ I especially like that once you start getting into actual coding it doesn't tell you everything. It even says that they expect you to have to look up new things they bring up in the assignments. It's a great skill to have in programming to be able to find information.
Here's a neat bookmark for some of projects ideas.