I had to do extensive research and read many books on making stupid conversation with people for my work. It helps if you can remember things about them, like if they have kids, the kids age, kids activities, generally people like to talk about their kids a lot. Also hobbies of theirs, basically just let them ramble on while going, "yeah, uh-huh, oh so fascinating, tell me more." I can never remember tidbits about people unless I talk to them many times.
Also I don't watch any sports (unless you count pole-championships because those are just cool) or tv really. I watch like Star Trek, stuff from the Disney channel mostly, Sherlock. But I don't have cable to any tv channels at all, ever since they changed the way TV works and you can't hook up a basic antenna to a old tv I just gave up, there's too many commercials anyways, which are cool the first time you watch them but after the 1000th time I want to kick the TV. Stay away from Politics, even if you're trying to be funny because it's all so stupid they just won't get it. It's weird but some people really, really, really like Trump, weird right?
Oh another thing people like to talk about if they do it is traveling, you can get somebody to go on and on about traveling. My job actually requires a bit of small talk to get people to pay me for my time, if it wasn't for me getting paid I'd never do it. If you talk to somebody that really like sports even if you don't care you can get them to tell you all about them, they might really like trying to educate you about them, lol so I do that a lot. The other girls think I really should learn about them for real but I just can't care and people like to tell me about them from my standpoint of knowing nothing because them from their viewpoint everything they say is solid gold since I have no opinions that go against their favorites etc.