Since you work in a quant firm, I am curious if there are any good public resources to learn about the techniques used by such firms. Aimed at a novice I mean. I’ve always had a curiosity about it, but I feel like whatever I can find is more basic than what is truly being done in production.

There are good public resources but they are expensive. One of the best resources for learning in depth quantitative techniques that is actually legit as opposed to Youtubers telling you how to squint to see patterns in a bar chart is the ARPM, which provides both a week long course and a year long course:

https://www.arpm.co/

It is a very math heavy course, highly technical and requires a great deal of existing math background. But the truth is that you will not be able to do much quantitative finance without that background anyways, so if what you want is a way to gain that math background then just crack open a textbook and get working.

I work at a fund, and you need millions in capital and infra. It really doesn't make sense to trade as a retail investor. Look up Dimitri Bianco on YouTube; he's quite reputable and explains why it's not really feasible to trade with your own money.

In my opinion: If you trade, trade with a firm.

You need a good background in mathematics and some knowledge of why you should be paid a premium by the market (e.g. carry, trend, various premia and so on)

Anything else requires millions of infra spend.