Making extra money outside of working


I was just wondering if there's other ways of making money other than working.
I'll obviously be working but I know it would be an adjustment, but also just more for fun/holidays etc.
Is there any way of doing things for money?
Here we have things like medical trials,but that only really seems to be an option is Oslo and Bergen. (Ideally looking in Trøndheim).
Are there any other ways? Thinking outside the box.

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