Broad, generic advice is almost always completely useless.
Any actually useful advice would need to be
specifically targeted and factor in many critical variables. For example, the career advice you give to someone with an IQ of 120 shouldn't be the same as the career advice you'd give to someone with an IQ of 80. There's also very big generational differences. The culture of each generation is radically different as are the problems each generation faces. This is why boomer advice is such dogshit. I'm sure a lot of millennials give advice to zoomers that's also complete dogshit.
Basically the advice needs to be specific, targeted, and factor in many variables (looks, IQ, location, age, etc.) with the person giving the advice fully understanding how each variable could effect the outcome. Very very rarely does advice ever do this, which is why most general advice is again, completely uselss.
Then of course you have the advice that's just common sense. A lot of the time this not only useless, but it's not even intended to be helpful, but rather, it's meant to be condescending. Like "take a shower". Because obviously every ugly incel is smelly and unhygienic.
There's a few facets of life where advice could be applicable to most people regardless of variables like demographics, location, age, etc. Nutrition is one. I've learned a good bit about nutrition and could potentially give advice about that, but I also don't want to argue with the raw meat goatis broscience spergs.