Galaxies are still somewhat of a mystery, but, we know a lot more about them because we cracked most mysteries of the galaxies. We know that in the middle of galaxies, there are black holes. There are 4 types of galaxies-Elliptical, spiral, irregular, and starburst.
An example of a spiral galaxy is our very own Milky Way.
The Milky Way has its black hole and all, but, it is special. It contains our solar system! It contains us!!!
An example of a elliptical galaxy is 4C.73.08
An example of an irregular galaxy is NGC 1427A.
An example of a starburst galaxy is m82.