You know anything about maths in business? I'm trying to go from intermediate to advanced English, and one of the things I was suggested was to learn about what interest me in English. So, I had a credit in Audible that I used to acquire Principles, by Ray Dalio. I tried to read that book many years ago, but didn't keep up. Then watched one video about how the economy works, and that was it. It's an amazing book, with great lessons, undoubtedly. But now I'm wondering how to do a regression analysis, how devirative instruments work (I kind of get it, but I don't get it get it). So...if you could suggest any channel, blog, reliable source to find answers to these type of questions, I'd owe you for life! (Quite literally).