I was so tired I barely managed to cook for myself. The only new skills you’ll likely to learn is new ways of coping with extreme tiredness (and no, a misspent youth partying still doesn’t prepare you for the tiredness of parenthood). You’re better off finding a TV box set you can half watch while feeding the baby rather than trying to engage your brain.
Enjoy parenthood. It is also the most rewarding job you’ll ever have.