I may get downvoted for this, but I&#x27;m going to answer the question you asked directly from the context given.<p>If you have no knowledge&#x2F;experience in databases, and you are solving a problem not yet at scale, the short (but possibly unsatisfying) answer is that it doesn&#x27;t matter.  I would encourage you to learn more about both non-relational and relational databases to guide your thinking for specific problems.<p>MongoDB is the most popular non-relational according to StackShare (<a href="http:&#x2F;&#x2F;stackshare.io&#x2F;databases" rel="nofollow">http:&#x2F;&#x2F;stackshare.io&#x2F;databases</a>).  Perhaps you want more of a database service on top of that though, in which case Firebase is easy&#x2F;cheap to get started with.<p>At the end of the day, each has their advantages -- for example, non-relational can give you a flexible schema and very fast retrieval -- but until you have more constraints for the problem you&#x27;re solving, it&#x27;ll be hard to make an educated decision.