"Truth be told, though, none of those things are really all that hard - they just require a bit of effort to learn how to do them. Finance and credit advice is readily available if you're willing to look. Cooking is just following directions until you're confident enough to make something up. Cleaning covers a wide variety of things, but most of them boil down to "point, spray, and wipe." Even basic auto and home repairs are mostly a case of reading a manual / watching a YouTube video / asking someone to demonstrate and then just doing it."
This is true, but it's all reactive. The Internet can cover a lot of how-to-do-it stuff, but it's knowing what to ask or even knowing when to ask it is the challenge. Doing your taxes is easy with online help, but most people who are just starting out don't know to go look for the info that tells them, "hang on to that particular receipt, because it'll save you a hundred bucks when you do your taxes five months from now". If you don't know and nobody tells you, you might never realize you need to visit the site that tells you how to change the filters on your furnace before they crud up so much that it breaks, or that your smoke alarms and septic system need regular service. You can easily find places that will give you a good list of tools you'll need when you move into your first apartment, but there's a lack of people and places that will give you a nudge when you sign your first lease that you need to look up that list and make sure you own a toilet plunger before the first time you need it.
There's a vast array of preventive and proactive tips that would be of huge benefit to newly minted adults, but not much in the way of compiled and easy to access pointers that suggest them, and that's what drives this particular lament.