Learning a new language is one of the most valuable choices an individual can make to improve their career prospects. They have the potential to create a larger impact than getting a degree at university (depending upon the course), and can open up a wide range of career opportunities that no other qualification can compensate for.
If you look at most large businesses, our global economy requires most of them to operate in multiple countries, creating a lot of opportunities for people who are bilingual or multilingual. The same can be said for careers in the public sector, where being able to communicate with government departments around the world is a valuable asset.
There are a lot companies which offer language courses, but if you’re not concerned with interaction with a tutor then there are a lot options out there which offer free courses in any language you want.