rtlwifi_new
The master branch of this repo is officially abandoned. If you are running a kernel newer than 5.0, use the drivers built into your kernel. That is a lot less work.
If you must have these drivers with an older kernel, then google the Backports Project, download, and build their codes.
If you are using a Realtek RTL8723DE, RTL8822BE, RTL8822CE, or RTL8821CE, then you need the rtw88 branch:
git checkout origin/rtw88 -b rtw88
Then follow the README there.
DISCLAIMER: If you don't read any of this README, I will not answer to any of your issues