Why do you invest in stocks?

Made a post yesterday but need to add clarification. I'm in medicine (anesthesia) with 2 years left in training. and then will be a full physician. Since college, I have been investing in VOO only. My plan will be to pay off loans ASAP dedicate 4-5k a month to VOO until retirement. The reason for this post is i've always loved the idea of stocks and looking at fundamentals to try to find upcoming companies. I did an MBA and loved this portion of my finance/accounting class. My portfolio only has