What resources would you recommend reading to learn more about product-led growth?

By far the best material you could read to learn about PLG has nothing to do with PLG. PLG is based off of the Scientific Method you learned in grade school. Go back and reread the fundamentals of how to go through the Scientific Method. Lessons around experiment design/methodology are highly valuable and should not be glossed over.

There are other parts though that are more focused around experiment logistics and team dynamics that the Scientific Method won't cover. But in my opinion, a good book around logistics is "The Goal" by Eliyahu M. Goldratt. I unfortunately don't have any recommendations around team dynamics. But my biggest bit of advice (as you can see from my other answers) is just over-involve your team and listen to them. Get their input on everything. It's not a democracy, but good ideas come from anywhere. The people around you are very smart, use it.

It is important to understand that PLG is a go-to-market strategy, not a product strategy.

I would thus encourage reading about go-to-market, and of course the different resources about PLG itself that exist.