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Let's talk about it.
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You don't necessarily have to go to school for computer science, but you could start learning programming and it's principles on your own.
The Odin Project
FreeCodeCamp
JavaScript.info/
Etc
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Sure, give us more about your background, interests, education, financial situation, etc.
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Do Computer Science. Pay attention in security class.
If you are interested, do Mathematics as well.
Saylor Academy has some CS courses for free:
https://learn.saylor.org/course/index.php?categoryid=9
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Computer science. The best way depends on your current situation.