All of the questions you need to answer there for a reason.
First and Last names. For obvious reasons, your Swiftie-Fandom card will feature your name, mainly so those reading it will know who you are. Feel free to use a fake name if you are uncomfortable with your real name being published.
Favourite colour Your favourite colour will be the colour of the shadow on the writing for your Swiftie-Fandom card
Favourite cat Oliva, Meredith or Benjamin? Taylor's cats are all cute, but it will help people learn a bit about your personality if they can read you prefered feline Swift-family member.
Favourite songs/Album These are the main part of your card. People who share your interest in songs/albums will connect with you through this section of your card.
Anything else? This is your chance to mention any Instagram or other social media usenames, so if people find that they share an interest with you, they can find you on social media.