I think is not about learning because of what has potential or is trending.
It depends on what type of data you are going to store!
Is it a graph-like structure with millions of nodes? consider neo4j
is it relational data types? Postgres seems fine
Do you need Geospatial, maps querying? try PostGIS
...
Edit:
Sergey Podgornyy shared an interesting video about this.
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I think is not about learning because of what has potential or is trending.
It depends on what type of data you are going to store!
Is it a graph-like structure with millions of nodes? consider neo4j
is it relational data types? Postgres seems fine
Do you need Geospatial, maps querying? try PostGIS
...
Edit:
Sergey Podgornyy shared an interesting video about this.