I once learned SQL in two weeks to pass a technical interview — got rejected in the end, but still funny to think how focused upskilling is very much possible. Note that of course I didn’t have any of the practical experience, but interestingly, the interview didn’t test for that only rote basic theory.

On one of the earliest jobs I did they asked if I knew Adobe Illustrator and I just told them yes. Got the job and learned it inside of a day.

There's a lot of software that if you don't use as a daily driver you simply forget and have to rapidly relearn when it's needed.