This is, from my perspective, the only advice that matters when discerning what to learn while seeking employment. Look at businesses and people that you admire and see what tools they're using and see what they're looking for. It's one thing to see that there are a lot of (potentially boring and poorly paid) jobs out there using some technology and another to see that you can do the kind of work you want to and find a job you'll enjoy if you learn something else.