Here are several videos I found useful while learning how to plasma cut.
I build a smelter for aluminum. I melt aluminum cans (and other aluminum) into ingots.
Oh Dang… I got a bolt in my tire!
After seeing this video, I bought a flap disc and THEY ARE AMAZING!
It is used in an angle grinder, and they are layers of sandpaper. They grind and remove metal very well!
I now use my flap disc for most grinding! I only use the old hard wheels to cut.
You can find it on Amazon
Here is a good video I found on welding with flux-core!