>>13208530what exactly do you want to do? the purpose of technology is to give power to the people (e.g a car gives you the power to walk faster while carrying bigger loads without having to touch them)
>What should I learnrealistically all of them,
electrical engineering, mehcanical engineering and comp sci are the fields that deal with that stuff, science like physics is more concerned with getting knowledge but you might need to advance science before you can make use of it by creating the technology that gives power to humanity
