Looking for passive/semi-passive sites or applications for Macbook

I'm in school and could use some extra money, I have a Macbook Air that I use for school work and would love to find a passive or semi-passive program, website, etc. that I could use while I do school work or leave my computer idle. Any suggestions?

submitted by /u/SPACECOWPIE
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source https://www.reddit.com/r/beermoney/comments/cyss05/looking_for_passivesemipassive_sites_or/