While there isn't a single official "fredi8" guide, this term most likely refers to the franchise or the Frida instrumentation toolkit. Below are the best guides for each: Five Nights at Freddy's (FNaF)
If you are looking for technical guides on "Frida" (the dynamic code instrumentation tool), these are the top resources: Quick-start guide | Frida
For the impatient, here's how to do function tracing with Frida: ~ $ pip install frida-tools ~ $ frida-trace -i "recv*" -i "read*" Five Nights at Freddy's Ultimate Guide: An AFK Book
: A newer edition released around late 2025 to update the series' mythology and address previous errors.