I'm going to be slightly contrarian and suggest two languages that are widely considered boring and old hat. All too many developers think they know what there

I'm going to be slightly contrarian and suggest two languages that are widely considered boring and old hat. All too many developers think they know what there is to know about both of them, and most of them are wrong. These are languages that will be useful to you in any shop in the industry; in fact you've probably had occasion to use them both already. SQL and Javascript. You may think you know them already. But they both reward in-depth study.