[pjc50]

Glad to be of reassurance. There's more in the world than it's possible for one person to know in a lifetime. The "last man who knew everything" died in 1829 ( https://en.wikipedia.org/wiki/Thomas_Young_(scientist) ). So we have to pick who and what we keep up with, and to what depth.

There's a good chance that something else could be trending by the time you graduate. The media mood is very ephemeral. For employment purposes it's better to look at job ads statistics (annoyingly hard to search for phrase) and make your own inferences from there; anything currently popular will take a while to sink. As with any statistics, also ask yourself what is left out.

Stackoverflow dev survey is a reasonable starting point: http://stackoverflow.com/research/developer-survey-2016

Javascript frontend has been big for a while, but suffers from a tremendous amount of churn. Maybe the best solution here is what people used to do with music: find someone "cooler" than you and copy their taste.