The title of the final episode is Cutting Steel Using a CNC Router (CNC Router Beginner to Pro EP 10).
There are many attempts to cut steel with a CNC Router on YouTube, most of them fail because the individual is using the recommendation or knowledge that is applied to cut steel on a mill. A CNC Router is lacking the rigidity and and spindle horse power of a mill so transferring the same cutting parameters will simply not work.
My approach is to get the surface speed as low as possible while maintaining the rpm going through the cut, so in other words without stalling the spindle. I find 12-13k rpm a good starting point.
The tool I use is from Onlinecarbide, it has a variable helix that will aid in reducing vibration. Here a link
https://www.onlinecarbide.com/14flvhe...

The Coolant I use you can find on Amazon:
As a Amazon associate I make money on qualifying purchases.
Cutting Fluid 585XT (Amazon)
https://amzn.to/3Oh1lly