minimizing the frizz with cornrows

What can i do for my cornrows not to get too frizzy ?

I did diy cornrows on myself and tried adding in hair yesterday but wssn’t able to 🫥 ( if you have any easy tutorials to follow pls feel free to share). i stuck to cornrows without extensions.

i sleep with a bonnet generally but should i get a durag so that it stay in place at night ?