Why was it targeting Chinese: Because they’re racist.
What is a poll tax? Its charging people to come into the country based on who they are. For example a person from China would be charged but people from Europe would not be charged.
Did they ever get paid back: Yes you can apply and get funding for community projects like the Kumara chinese gardens.
What was the yellow peril: The Yellow Peril is a racist colour-metaphor. Basically saying the Chinese were bad and you shouldn't let them in to your country.