Okay. And I know you're using the duolingo app, which doesn't thoroughly explain things. Katakana is used mostly for foreign words, onomatopoeia, animals, and plants. You obviously would write your name in katakana.
It really helps to know the difference between hiragana and katakana. I recommend google searching a hiragana and katakana chart, just so you know which is which. A rule of thumb: hiragana is curvy while katakana is angular.
I'm using the duolingo app too. I'm almost done with the entire course, not to toot my horn. I think it's a good way to learn the basics of the language. If you ever get stumped with anything, you know who to ask.