Which languages/frameworks would help me be viable anywhere in the US?

To add to that question: What languages/frameworks would aid in my quest to become “independent”?

I’m expecting my wife’s medical school will have me moving a few different places in the US in the next 4-8 years. As is the case, not every city in the US is a tech haven and I need to make sure my skills make me as viable as possible. This could even mean I might need to do freelancing or independent work that could bring in money. What sort of programming languages or types of programming(front end, mobile, etc.) do you think could help me realize this goal? I’m a senior in college if that matters.