As space expands, the galaxies get farther away from each other, but do not get bigger themselves, right? What is the difference between “space expanding” and the galaxies of the universe merely moving away from each other?

Everything is getting further apart, not just galaxies. Stars inside galaxies are moving apart, even the molecules inside you are gradually moving apart.

Now you won’t see this happening on a small scale. It’s impossible to detect. However on the macro scale, the big picture, we can see the universe is expanding. If it continues indefinitely then we experience what is called the big freeze, where everything ceases to exist, including molecules.

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