If you're studying things that will help your career, you're working. Don't study for free either. Many employers will pay you for this time (if hourly) or credit you in other ways. If not, find a better employer. Never work for free. Your employer isn't your friend or your family.
If you only study things your employer will pay you to study, you'll be an expert in things you need for your current job - you want to be an expert in things you need for your next job too.
If my current job is programming engine control units, they'll pay me to train in things relevant to that, like MISRA standards - but if I think my next job will involve blockchains, the ECU manufacturer ain't going to pay me to study those.
