Is the goal of the app just to learn something or is it going to be a production app?
I've used Mongo in the past, but for your average web app I think it's a poor choice ... unless you're going for mega huge scalability (in case of which there's a lot to be said for Mongo), do yourself a favor and go with an RDBMS - so much easier to use ...
MySQL or PostgreSQL or another RDBMS doesn't really matter, it's a toss-up IMO.
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Is the goal of the app just to learn something or is it going to be a production app?
I've used Mongo in the past, but for your average web app I think it's a poor choice ... unless you're going for mega huge scalability (in case of which there's a lot to be said for Mongo), do yourself a favor and go with an RDBMS - so much easier to use ...
MySQL or PostgreSQL or another RDBMS doesn't really matter, it's a toss-up IMO.