Honestly, the most important skill is to learn how to learn. There are some basics that will always be useful such as SQL or any of the popular high level programming languages. But in 10 years, the demands of whatever sector you want to work in will have changed in ways that we can only guess. But learning how you learn, what techniques help you stay focused are much more useful in the long term.

If you are serious on going into research, seek out (abstract) mathematics. It's a language in itself and (in my experience) takes the longest to become comfortable with.