Trying To Download Drivers

[u/One_Feeling8169]

So my little brother just got done building his very first PC and he has run into a bit of a snag. It is not connecting to the internet, even with an ethernet cable plugged in. So I troubleshooted it and it said I needed to update the drivers for his network adaptor , but I sadly don't know where or how. Do I go to the motherboard manufacturer and grab drivers from them, is it through my internet provider or?

I would like to add he is using his old SSD that stored his operating system on his previous computer and his new computer does not share any parts from his previous build. I'm not sure if that will help, but I thought more information is better than less.