My first ever question in this subreddit... Help

I just learned about this project a day ago. Today I managed to boot it on the first try (I'm surprised cuz I'm stupid)

I need to add .kext how do I do that so I don't break my config.plist ? Its about USB tethering because I can't connect my Ethernet lol Even if I had a compatible wifi card the support is up to High Sierra, right ? I'm trying to get 10.15 working Thanks for reading this