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MongoDB 101: A Free Course By Academy 3T is a free course for beginners in mind. It covers the whole spectrum of MongoDB basics – querying, importing and exporting data, the aggregation pipeline – in just two hours, making it ideal for anyone who wants to learn MongoDB, fast. Because data is stored in name-value pairs, querying large volumes of data can be quite fast in MongoDB compared to relational databases – with the right indexes. It has proven to be a game-changer for companies like SEGA Hardlight, Thermo Fisher and countless others who have chosen to run their MongoDB instances in the cloud.