When I started my outdoors cultivation, I faced several problems for being autodidact and having to learn everything myself, I had problems with Thrips, Leaf Miners, Fungus Gnats, Bud Rot..., there were many days of rain in a row, and then very hot days with lightning sun very strong and cold nights.
I believe this link can help you: https://www.growweedeasy.com/cannabis-plant-problems/bud-rot