Well, there are galaxies and there are galaxies …. Just like there are cities with lots of people like LA and tiny cities like Summerland CA!
Astronomers estimate that there are about 500,000,000,000 (500 billion) to 1,000,000,000,000 (one trillion) GALAXIES IN THE OBSERVABLE UNIVERSE.
So there are dwarf galaxies, normal galaxies and super large galaxies.
The Milky Way, the galaxy, the one we live in has about 300,000,000,000 stars. That is about 300 billion individual stars.
Our closest star is the Sun and the Sun is pretty much an average star, actually it is more massive than the average star in the Milky Way. But other than that it is a typical star.
There are about 250-400 billion stars in the Milky Way galaxy, including our solar system. But one important fact is that most (about 90%) of the matter in the Milky Way galaxy is "dark matter", which is invisible to eyes and telescope. The nature of the dark matter is still a mystery. There are also far larger galaxies in the universe, one of the largest galaxies known so far, consists of about 100 trillion stars.
The number is enormously different depending on the galaxy. Small dwarf galaxies can contain as few as 100 million stars, while the giant elliptical galaxies can contain trillions of stars. Our galaxy, the Milky Way, contains about 100 billion stars.