Do you study tools that are not applicable to your current job?

Let's say that your current job only allows you to use excel, do you think it would be worth studying outside to prepare for new positions that use power bi, sql, python and others? Or do you think it wouldn't be of much value to learn something that I can't put into practice right away? Because all this would consume time and resources, let's say the time after work, whether on weekends or on weekdays. Or would I be better …

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