This article contains spoiler for The Mandalorian season 3, episode 3.Coruscant isn't actually the center of the Star Wars galaxy – it's far more exotic. Viewers can be forgiven for thinking the city-planet of Coruscant is the center of the galaxy. It was the galactic capital for millennia, with the politics of an entire galaxy revolving around its senate. Certainly the people of Coruscant got used to thinking of themselves as the most significant beings, the ones who decided the fate of the galaxy. Even the Jedi Order chose to establish its main temple on Coruscant, symbolically supporting the view this planet was more important than any other. The Mandalorian season 3, episode 3 riffed on this, with Coruscant residents admitting to their egos.
Coruscant is not actually the center of the Star Wars galaxy map, though. It is indeed situated in the Galactic Core, a region of cosmic stability and economic prosperity; there are stable hyperlanes binding many of these worlds together, explaining their dominance. It's generally believed humanity evolved on Coruscant in Star Wars, spreading out into the stars, which explains why the Core Worlds are dominated by humans and the Mid and Outer Rim are inhabited by so many diverse species. Palpatine's regime was centered on the Galactic Core, and he deliberately set humans against aliens, Core against Rim. But even the Core Worlds do not lie at the heart of the galaxy.