Reading/googling can help to a degree but even chefs disagree on the correct techniques for certain things.
Learning with someone to guide you and reassure you you're getting it right - and can recognise and rescue you if it starts going wrong (now THAT is a skill) is better.
Eg there's a friend's quote 'how do you know when the butters done?' And Monica a chef replies something like 'about 2 minutes before it looks like that' (I'm still not sure what the hell butter had to do with either trifle OR shepherds pie!
Mustbemad on another thread the op has a 12 year old dsd and a 10 year old ds and the family is now adjusting to another dsd. She was saying all she expects the first 2 to do is make beds, draw curtains/blinds and put toys away. New dsd was expected to do more at her mothers including cooking, she's 15 (and is now making herself out some kind of modern Cinderella), the op was shocked.
I too as a mature student at uni was really shocked at the number of otherwise sensible students who had no idea of budgeting, cooking (yes even struggling with eg boiling pasta), basic household chores like laundry (lots of mixed wash accidents).
I really do think if by the time your child is 18 they can't do the basics to look after themselves (disabilities etc aside), you haven't done your job as a parent.
Oysterbabe I also said on another thread that it's not necessarily easy as an inexperienced and unconfident cook won't know how to adjust ingredients to their own taste, won't know certain ingredients can be replaced and what with or that leaving them out won't 'ruin' the dish.
Fleur - wondering if your my bro's wife, that sounds like my sister yet she makes it sound like she's chained to the kitchen!
I rarely follow a recipe for cooking now as I know what we like and cook accordingly. New recipes I'll read a few times, decide how I'm going to alter it then give it a go.
Baking I at least need the amounts for the ingredients.
My mum who is an amazing cook doesn't even measure out ingredients for baking does it all by eye/touch and it's always perfect - meanwhile my scones barely rise!! And I can't seem to crack choux pastry. I can do good pastry and sponge cakes though.
My ex hated cooking but he was a VERY fussy eater (only ate 6 things when I first met him) and had a very basic skill level initially. His mother is an ok but simple cook. After we moved in together I got him trying other foods including being involved in the cooking of them and he went from a very fussy eater who 'didn't like foreign food' to a lover of Thai curries and stroganoff!