Hetty58
I do know someone who says she 'can't cook'. It's more a case of won't even try though. She can read and use a computer. She can follow instructions - so I don't believe her.
You do have to have a 'feel' for it though and some people just don't develop that. Like my OH, who now does most of our cooking because I find day to day cooking boring (though I like to do dinner party food) , but he still doesn't 'get' testing for 'doneness' or tasting... I've had plenty of meals 'cooked' by people who really can't cook (notably my late MiL) 
So, I can cook, I can do small home maintenance tasks, a bit of basic joinery, chop wood, wield a chainsaw, do decorating, knit, crochet and sew, drive a car (and a horsebox) and put petrol oil and water in as required. I could ride a horse until forced to give up by arthritis, and I used to ride a bicycle. I can swim after a fashion (side stroke learned from my granny). I like to garden but my veg growing is a competition with the local wildlife which they often win... I can just about manage my smart phone. I have enough competencies to satisfy me.
I'm a bit hopeless with money, though. OH manages all that.