[ErikAugust]

"Most start ups will die because of mistakes made from the one bucket of common errors – about 90% of them. These include bad financial management, hiring errors, product errors, marketing errors, etc. I believe they can be easily avoided, but can also be easily forgotten about when you’re busy hustling."

As far as I remember the reason most companies were dying (from a YC survey, I believe?) was product-market fit. This is not something that can be "easily avoided", and certainly not by simply having a mentor.