I've made basic webapps with Scalatra and Scala by keeping all the complexity in the Scala, which I know quite well
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That's a good start, I may dive into database driven apps now. I know its a swarm of technologies. Don't worry about JavaScript or jQuery right now since those are front-end tools that add icing to the cake (unless it's node.js, but let's keep it simple).
Databases generally fall into 2 classes: NoSQL and SQL. I'd stick with SQL based databases such as MySQL, Postgre, and SQLite. For the most part, they can be interchangeable. MongoDB falls into the former and is an entirely different way of thinking about databases.
Cool, thanks. Any particular thing I should look out for? "MongoDB" - is that anything to do with this? SQL-lite?