I'm going to repost my answer in that previous thread, but with an addition.
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There is no secret.
You either need to have a very valuable skill that people are willing to pay you for, or you start a business selling a product or offering a service (basically having a valuable skill) that people are willing to pay you for - and you scale with time.
Or, you find a very rich person (there are lots of wealthy people out there in the world) who takes a liking to you and gives you life-changing money—either as an investment in a business you’re interested in pursuing but lack the funds for, or as a grant.
Or, you get lucky like if you had bought Bitcoin back when it was worth a negligible amount and then you check back years later (2026) to find out that forgotten investment is now worth a lot of money. But that's likely not going to be the case for you.
I also wish there was a secret I could learn about to make me rich, because I'm not rich, and I really wish to be.
P.S. Don't do anything illegal in your quest to make money. It's more fulfilling to win a game without cheating.
The hard part is finding a problem and then the actual hard part is coming up with a solution that you can produce for cheaper than someone is willing to pay for it.
Forgot to mention - this book is now public domain, so it’s free and you can find a copy online pretty easily. Or, easy to buy as a book for about $5.
But put it to work in terms of investment? what if you don't have a big enough amount?
You can read this in a day. https://icrrd.com/public/media/16-05-2021-070111The-Richest-...
Has it helped you though, significantly?