If you already enroll to https://minato-jf.jp/ , so you can see the picture how hiragana words works. Let's know Hiragana words by looking this chart :

How to recognize Hiragana and Katakana words? Of course need to memorize them :P. If you not memorize them yet, you can recognize by the shape. Hiragana words are bit curly while Katakana look a bit boxy.

The chart below is for Katakana. Bonus question..why need 2 types of writting? Because Hiragana are used for Japan-origin word such as egg(たまご) while Katakana are used for non Japan-origin word such as foreign name such as Faiz (ファイズ) pronounced as Faizu.