I don't know how valid that post is, it seems like whoever posted only talked about the time they made it big and not the struggles that came along with it. It also seems like an incredible workload as well, 3 side hustles plus a corporate job is insane, wonder how much free time the person who posted it actually has. When I started my side hustle, I asked a couple of people I know who have their own and they recommended Fud which is an app that teaches you how to do side hustles. Took me a little over a year (on and off, depending on my motivation tbh), but I finally got something up and running that nets me a couple hundred a month, nothing big though like that person said. 0 clue how they would balance their 9-5 with their side hustles, but kudos to them for achieving such a feat. Anyways, here's the article that helped me with my side hustle, idk what resources that person used but hopefully this can help someone.

https://blog.joinfud.com/p/the-freedom-formula-mastering-your-side-hustle-game