It's like so many things in life are really simple but because of too much information and our nature to keep finding better, faster solutions, we keep getting lost. Consider for example, weight loss, there are a bazillion things on the internet about "Keto diet", "Paleo diet", this diet, that workout, but at the end of the day the formula is still as simple as calories in - calories out = weight loss.
Same goes for making money, there is an often cited pdf here about making money[1] written in 1880 which still beats most of the contemporary "cool" advice. The rules are simple and don't really change that much over time but we like to add layers and layers of our own stuff over it and then think to ourselves, gee look I've found the answers and my answer is the best answer.
[1] https://www.fourmilab.ch/etexts/www/barnum/moneygetting/