We often hear people comment that they went down a "rabbit hole" on the internet - getting lost as they look up one topic only to be led somewhere else. In the case of Christian Nationalism, I would likely compare finding information on the internet like being in a rabbit warren - it's dark, lots of tunnels, confusing and easy to get lost.
Be mindful as you do read about this topic and ponder the implications, that we are always invited to the "renewing of our minds" (Romans 12). Balance your reading with refleciton on the bible or other inspirational writings. This will help us all to have a hopeful and enlightened perspective. For nothing is impossible with God.
Here are some resources I've found helpful:
Public Religion Research Institute
New York Times Article: The Day My Old Church Canceled Me Was a Very Sad Day
BBC Article: Project 2025: The right-wing wish list for another Trump presidency
Christians Against Christian Nationalism
National Council of Churches of Christ: The Problem of Religious Nationalism