I'm thinking about studying a language at university. Which one should I choose?

Studying any language to the highest level, even a 'dead' one like Latin, is a wonderful intellectual training.

'Useful' languages today, and for the next few decades, will be Spanish, Portuguese, Russian, Chinese - in terms of the number of speakers, the political significance of the countries  and of their economic power or potential.

German and French are also important languages in every sense; and Japanese continues to be important.

Employers with international interests will often say that they want people who can speak any foreign language well, the more exotic the better, If I was thinking of that I might consider Vietnamese: the 13th most populous country in the world and one that is currently developing at an astonishing rate, and likely to continue doing so.