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learnyounode
Learn You The Node.js For Much Win! An intro to Node.js via a set of self-guided workshops.
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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.
You can start by going through the official Node.js Guides. Complement that with learnyounode, which is a nice interactive tutorial in the terminal. Add to that the Basic Node and Express section from freeCodeCamp to solidify your knowledge.
Convert knowledge into skill by building things. freeCodeCamp has some projects that fit with their curriculum. app-ideas has many project ideas including user stories to guide you. Not all of them involve a backend, most of them require you to know some frontend and use multiple tech across the stack.