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She does not address people who are not comfortable turning an old PC or a SoC singleboard into a pfSense firewall.
I didn’t watch the video but you can use DNS over HTTPS in Firefox to accomplish the same thing. It’s just a setting.
Though you’ll only be protected in Firefox.
Do some research and reading about DNS over HTTPS and over TLS.
Have you read the pfSense documentation, you do need a set of compatible hardware so the firewall becomes functional:
The best way to ensure that hardware is compatible with pfSense software is to buy hardware from the Netgate Store that has been tested and known to work well with pfSense software. The hardware in the store is tested with each release of pfSense software and is tuned for optimal performance.
For home-built solutions, the FreeBSD Hardware Notes for the FreeBSD version used in a given build of pfSense software is the best resource for determining hardware compatibility. pfSense software version 2.6.0-RELEASE is based on 12.3-STABLE@ef1e43df92c6. Another good resource is the Hardware section of the FreeBSD FAQ.