This is the 69th most frequent Spanish word.
eso
"Eso" means "that" in English.
In this sentence, 'eso' acts as a pronoun referring to something previously mentioned or implied.
Eso es lo que me gusta.
That is what I like.
Here, 'eso' serves as a demonstrative pronoun referring to the attitude or manner of speaking.
No me hables así, no me gusta eso.
Don't talk to me like that; I don't like that.
In this usage, 'eso' refers to an abstract concept or idea about traveling, performing as a neutral demonstrative pronoun.