What Happens When Two Stars Collide?

Galaxies don't collapse into a super dense blob of stars, it's because all these stars are moving pretty fast around the centre. So when two galaxies collide, they keep that spin, and they keep going around centre - sometimes even faster. And so they can become like a really huge, spread out new galaxy. But also, like, the collision would disrupt the structure of both galaxies,. Just like if you have two stars or two solar systems colliding into each other, like, it would be chaos... but those things are typically much more separated. The distances between stars is much, much bigger, relatively speaking, than the distances between planets. Also, galaxies of other stuff in them