Batman the worst case of this
Mastered all martial arts of which there are thousands
Still had time to become a PhD level biochemist, chemistry, forensics, criminology, applied psychology, sociology, computer science, political science Diverse Environmental Training, Security Systems, kinesiology etc
Fluent in fukk knows how many languages
Physically out performs every Olympic level athlete in endurance, strength, speed, balance, power, agility kinesthetic awareness, etc
Beats every military personnel in marksmanship, stealth, strategic and tactical awareness, reflexes etc.
Has spent more than the planet's combined military budget on tech including a multi billion dollar space observatory and an all observing brother eye that is a potential threat to the planet...all this without so much an eyebrow raised from the IRS
Is simultaneously the most grounded superhero yet supposedly without question from his fanboys can beat what is a pantheon of gods in the justice league because prep time
But a few decades ago he was catching hands from world war 2 vets and thugs
He the most realistic hero tho