I think the most important skill is resilience and problem solving. Which are not exactly easy skills to develop per say but its important for the scientific process. Especailly in the early stages of your career of not giving up after things go wrong or you fail an exam – I’ve failed plenty in my time but its the fact we don’t give up and carry on means we are constantly learning! A willingness to learn and gaining experience in being able to problem solve around different issues that arise is key and will take you very far not only in science but in many other aspects of life.
It sounds silly but- dating and titling your notes! You know when your teachers asks you put put the title and date at the top of the page? well lots of researchers still do that: it is such a useful skill for keeping a lab book ( experiment notes) and it really helps when you are looking back for specific information!
I’d say first and foremost curiosity… you need to be asking questions especially why and how questions all the time. Beyond that I’m inclined to say problem solving. You need to never give up when faced with problems… work them through until you find an answer.
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