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Udemy has a great piano course that you can pick up cheap (€11ish) if you visit it in incognito mode in your browser it'll offer you a discount. The course is called piano for all. That's how I learned and people tell me I'm pretty good.
Courses about how to make money online come down to drop shipping and/or affiliate marketing. But both of those need you to build an audience which is the hardest part, or just flood Facebook with ads, which costs money that people trying to make money...usually don't have
Picking up women courses. No. Don't do it. If you can talk to a guy, you can talk to a girl, just don't be a misogynist or a pushover and you'll be ahead of the pack. Go to a meetup.com group in your hobby interest and stay casual.
If you want to learn something useful consider coding codeacademy.com or video editing insidetheedit.com . The video editing course teaches some cool meta skills too like how to move forward in the industry. How to handle screaming bosses etc, which in some ways is more helpful knowledge and can probably help(transfer) a little with your dating life too.
My family and I have saught certifications and pirated content has helped us pass without expense beyond the test. I find the content on udemy, pluralsight, et al is more relevant than youtube to teating for certificates.
If it is a general topic youtube or khan academy is pretty good, but deeper level skills are typically pay to learn unfortunately.
You can find most video lessons on any subject on YouTube for free if you look in the right places. If you are looking for education you can try Khan academy which all the lessons are for free once signed up with an email.