Short term stock trading with solid gains, what's the strategy behind it?

So, a couple of weeks ago at a buddy’s party, I met this guy who works in investment banking. We started chatting about stocks, and I had to laugh because his approach is *way* different from mine.

This dude's got a knack for picking short-term winners, and I’ve seen him pull off 15-30% returns like it’s nothing. We’ve traded a few times together, and I was surprised how chill he is about it. No heavy charts or fancy stuff, just a solid sense of timing and market feel.

It’s got me thinking: What’s the secret sauce? Is it all about timing or maybe some inside info? How do these guys decide when to buy and sell?

Anyway, I’m curious if anyone here’s got any insider knowledge or experience in the banking world. How do you guys play the short-term game?