A direct impact is unlikely - by 2029, scientists will have already calculated Apophis's orbit with sufficient precision. The asteroid will indeed pass very close to Earth (closer than some satellites), but collision is ruled out by current models. Of course, there's always some degree of uncertainty in space, so astronomers continue to monitor it, but there's no panic at any serious observatory.
So where do those scary predictions come from? Often it's either old calculations that got refined over time, or just distorted information floating around the internet. When the asteroid was first discovered, there really were non-zero probabilities of impact - and that's what a lot of websites keep using, even though those numbers are way outdated by now. Plus Apophis pops up in sci-fi movies and articles from time to time, which also tends to hype things up.
If you're curious about what'll happen in 2029, expect something cool: the asteroid will be visible to the naked eye and will be great material for astronomers. But it's more of a celebratory event for space enthusiasts than something to worry about. Actually, scientists are paying way more attention to finding truly dangerous objects we haven't discovered yet.