Are there any bootcamps that teach both? I suppose if there were, they'd lack in depth though.
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Another thing to keep in mind is what you will enjoy learning more. If C# aligns better with your hobbies then it'll be much easier to spend hours on end practicing it. Many coding languages share similar structures and once you know one very well you can pick up the others easily. Be careful of programs that teach multiple stacks as you end up spreading yourself thin and becoming a "jack of all trades, master of none."
Hope that helps and feel free to reach out if you have any additional questions as you start this journey.
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