Quantitative Analysis and Probability in Trading (Market Makers, HFT, Quant Firms)

The past few weeks, I have jumped down the rabbit hole of quantitative analysis in trading. I have researched a little bit of stochastic calculus, Monte Carlo and Geometric Brownian Motion in Python to create future price charts, using matplotlib. I am in college and do a bunch of trading from my own portfolio, trading equity options and futures, along with commodity futures and future options. I was wondering what quantitative analysis strategies these quant firms and market makers use. I'm assuming this information is pretty limited but was wondering if any quants on this forum could pitch in a bit and give me a little idea of what you guys are using for quantitative analysis and finding probabilities of security price movements. Thanks!

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