I have some recent experience of this where a friend switched into web dev from a totally unrelated (non-computer) field. Originally she was looking at Python/security as a path, but then changed to web dev as she was more interested in that. Did an free Google course online, learned JavaScript and (IIRC) a bit of React, and 9 months later was working in the industry. She did this in her spare time on top of her day job. She's been a year in the industry now and she has had a couple of promotions and is doing well (double her previous salary)...
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