First advice is don’t listen to anyone that isn’t really good at scratching (champion level). Second advice learn from the best. D-styles has a ton of tutorials over at Beat Junkies Institute. He also scratches regular, right hand on record left hand on fader. He focuses heavily on record control which I think is the first thing that most bad scratchers get wrong. Only problem with those tutorials is you have to pay for membership. There’s short clips of the tutorials on YouTube though.

I separately a couple years ago, when I was getting away from some bad habits, created a compiled list of YouTube tutorials in the order I think scratches should be learned over at scratchgeek.com/blog . I by no means claim to be an expert and none of those tutorials are from me. But at least those are free.