I am doing my homework about Pasive Voice and I don´t get why there is a square bracket. Surely, it is not so complicated, but I am a beginning student. Please, help me, I would thank you a lot!
"The other great thing about Miami is [it's] got a lot of culture there, specifically, Latin culture".
Square brackets are used to mark changes by an editor.
In this case the man in the video, speaking quickly, said something like "The other great thing about Miami is got a lot of culture".
The editor who wrote the transcript noted that there is a mistake here and corrected it by inserting the word "it's" = "it has". Because this is an editor's correction and not something the man actually said, the editor put it in square brackets.
I expect that the square bracket indicates a place in the sentence/phrase where you can substitute in other words. For example:
"It's a beautiful day to take [Mary] to the park."
"I'm not usually partial to [sweets] but I like [these].
In your example, the word "it's" can be substituted for "the city has" or some longer phrase.
By the way, square brackets usually only appear in written English in the context of a lesson or a technical discussion (or a transcription), or occasionally in a novel or poetry as a literary device. They aren't used as punctuation in common written English.
Edit: Based on the additional detail in the comments, the "[it's]" is something the transcriber added to make a spoken comment into more grammatically correct English.
