It’s not about knowledge. The stock market is fundamentally chaotic as it responds not only to external signals (like firm profitability) but also to itself. Following the market is essentially just the strategy of holding long enough and in enough stocks that you filter out the high frequency swings and focus on pure surplus extraction. If you try to follow the high frequency variations, you have to predict them in advance to take advantage. You can only do that if you have shit loads of data, a good algorithm and maybe a healthy heaping of insider knowledge. Most day traders don’t have that.