Ken Jennings ran home from school every day just to watch Alex Trebek host Jeopardy!
Thirty years later he is the one sitting in Trebek's chair – and he just gave away the secret.
Two categories decide who wins and who goes home, and almost nobody studies them.
How to Study for Jeopardy According to the Man Who Won 74 Times
If you only have time to study two things before walking onto the Jeopardy! stage, Ken Jennings says make them U.S. presidents and world capitals.
"Those are the two things that are like the most bang for your buck if you're cramming for Jeopardy!" Jennings told Fox News Digital at the TCM Classic Film Festival.
On the presidents, he doesn't mean just the names.
"Know their years, know their vice presidents, know their home states and first ladies," Jennings has previously said.
On world capitals – he means every country on the planet.
Jennings memorized all 195 of them before his record-breaking 2004 run, the same year he banked $2.5 million over 74 straight games.
He also recommends Shakespeare, opera, constitutional amendments, and university towns for anyone with extra time.
But beyond cramming, he says the single best preparation is the most obvious one.
"Watching the show is the best way to prep for the show," Jennings said.
"If you watch Jeopardy! the rhythm of the host's voice will kind of get into your pulse," he explained. "You'll know the kind of stuff that comes up, the kind of material. That's how you become a good Jeopardy! player."
Serious competitors use the J! Archive – a database of every clue played in the show's history – as a playbook, drilling repeat categories until the answers come automatically.
What Ken Jennings Says Every Jeopardy Contestant Gets Wrong
Every contestant who makes it onto the show has already cleared a very high bar just to get there.
The mistake is thinking that's enough.
"Everybody there has passed a very hard test to be on the show," Jennings said. "It really comes down to who can perform under pressure because these people are not used to doing this with lights and camera and everything."
Some players rise to the moment.
"They'll suddenly become their best Jeopardy! selves," Jennings said.
Others freeze completely.
"Some are a little more deer in the headlights. I absolutely remember that. It's very overwhelming."
Jennings says he feels genuine empathy for every contestant who walks out – because he remembers exactly what that pressure feels like.
"I'm always thinking about their well-being because I remember what that's like," he said. "It's intense."
He even wishes the rules allowed him to jump in when players make costly mistakes – like the time he watched a contestant miscalculate her Final Jeopardy wager and there was nothing he could do.
"I wish I could jump in and do people's math for them, but I'm not allowed, constitutionally," Jennings said.
The Alex Trebek Standard
Trebek hosted Jeopardy! for 37 seasons – more than 8,200 episodes – and won eight Daytime Emmy Awards for Outstanding Game Show Host before his death from pancreatic cancer in November 2020.
Jennings has been clear from day one about who set the bar.
"Doing an Alex Trebek impression is basically the best way to host Jeopardy!" he said. "He really perfected it, so if you're getting as close to Alex as you can, you're going as close to perfection as you can."
Trebek told reporters in 2020 he had "always insisted that I be introduced as the host and not the star" – and Jennings built his entire approach around that same philosophy.
"The host of Jeopardy! is not the star," Jennings said. "If everything's going well, the game and the contestants are the star."
Nobody was more surprised than Jennings when he landed the job.
"People would ask me if Alex were to retire would I like to be a host," he recalled. "And I said, 'That will never happen in a million years. They'll get a real broadcaster for this job.' Nobody is more surprised than me that I'm hosting Jeopardy! – but I just love this show so much. I feel very lucky."
The Jeopardy Taping Schedule Secret Ken Jennings Just Revealed
Most viewers have no idea how the show actually works.
A full week of episodes is shot in a single day.
Jeopardy! has operated that way since the 1980s, recording five shows back-to-back at Sony Pictures Studios in Culver City, California, with the studio audience swapped out at lunch.
"We do five *Jeopardy!*s in one day," Jennings confirmed. "When a player wins, they have to rush off stage, put on a new outfit. I put on a new suit. We come back out 10 minutes later and I tell the great lie, which is 'yesterday on Jeopardy!' – but it was not yesterday. It was 10 minutes ago."
For big winners like recent champion Jamie Ding, that schedule turns a winning streak into a genuine endurance test.
"It's a real marathon for them," Jennings said. "They've got to play and then go back and play again."
Sources:
- Brie Stimson, "Ken Jennings on the 'Jeopardy!' prep trick he swears by and the category that made even him sweat," Fox News, May 22, 2026.
- Deseret News, "Ready for the 'Jeopardy!' test? Here's some tips from GOAT Ken Jennings," December 19, 2023.
- Jeopardy.com, "Alex Trebek's Legacy, 1940–2020."
- Trivia Bliss, "Five Insider Behind-the-Scenes Facts About Jeopardy! Taping."