A friend of mine has always had issues with a high level of acid in his hands that does a lot of damage on his guitars. Not sure what to do there except maybe a change in diet? Don't know...
There's also the Caged system. I had a book and video on it once. Here's a YouBoob search for some examples (I haven't watched any so I can't recommend one over the other):
Caged system explained
At least it's a lot harder to accidentally cut off a finger with those tools!
(I had a friend who unfortunately did just that with a chop saw... It was his fretting finger too. He had to relearn how to play his guitars, but he did!)