-If you could instantly learn one new skill (for your career or personal life), what would it be and why?

It would be a great speech = speaking skill.
It is working out hardly for interviews. = It’s really hard to use it effectively in interviews. / I find it difficult to use it well during interviews.
And I think it also helps in my dailly life too.
Making new friends, Expressing my opinion, like that. = For example, when making new friends or expressing my opinions.