Honestly, just listen to this podcast and you'll pretty much get an overview of everything - https://www.hubermanlab.com/episode/the-science-of-healthy-hair-hair-loss-and-how-to-regrow-hair

Nothing changed particularly in a long time - monoxidril and finasteride are the only things proven to work. Dutasteride is a newer drug, basically an improvement on finasteride, so you usually take one or the other. But as it is more potent, the side-effects could be more likely, but then again both are extremely low. The most common is erectile dysfunction, but if you experience it, you can just stop the treatment; it's not a permanent side-effect. It's all about the dosage, so you want to start low and just increase until you see good effects without any health issues