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I've been wrecking my brain how to make $10 on anything onlineIf you are really serious about $10 (and not some other larger number), here are some tips:
* Pick a topic you know really well (programming, cooking, sea diving, whatever)
* Make an infographic (get started on the topic of your choice, some specific and useful practical tip, etc) - picking a template from free tier Canva will go a long way in producing a good looking graphical post (you can even do animations)
* Put this up under pay-what-you-want model on sites like Gumroad (so, minimum price free but users can pay if they wish) - see https://mathspp.gumroad.com/l/cheatsheet_list_comps_101 for an example
* Post a sample on sites like Twitter, Reddit, etc (just the nice looking graphic, add a link to Gumroad later in comments if the posts start getting attention)
* Make a video to show demos (if applicable)
* Be consistent! Give it your best shot for topics you are really confident about. Listen to feedback. Learn and Build in Public for better reach (see https://swyx.io/learn-in-public and https://chriscoyier.net/2012/09/23/working-in-public/)
If you want an example for someone making a living by doing things like this, check out Julia's https://wizardzines.com/