Andrej Karpathy says a good tutor adapts instruction to a learner's current ability, keeping the material appropriately challenging rather than too difficult or too trivial.

“really like really served me all the things that I needed at my current sliver of capability I need to be always appropriately challenged I can't be faced with something too hard”

“or too trivial and a tutor is really good at serving you just the right stuff and so basically I felt like I was the only constraint to learning like my own I was the only constraint I was always given the perfect information I'm the only constraint and I felt good because I'm the only impediment that exists it's not that I can't find knowledge or that it's not properly explained or etc”