I am 18 and have worked in fast food for three years. What is a job I could get that would provide me with some skills?

I want to get a job where I learn something and that is a semi challenge. Getting a job that involves having to think would be awesome. Every job I have had so far just has just been physical works. I may be asking a lot at 18 but I have volunteered at a local hospital for three years and have been working constantly since I was 15.

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