I started my exploration in web dev using Mongo, but consistently found myself doing relation things with it, even though my data seemed non-relational at first glance. Eventually, I took the hint and kicked Mongo to the curb, and have happily been using MySQL and Postgres since.
NoSQL certainly has its place in specific situations, but I'm a strong believer that it should never be the first choice. You can do a lot with SQL, and some databases even support direct json queries, so there's no reason to pick NoSQL over SQL in the vast majority of situations.
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