What Katakana Is For
Where each script shows up in real Japanese.
Chapter 10 of 10Page 1 of 3
Where Each Script Shows Up
You can read both now, so here is what each one does.
Katakana marks a word as foreign or as a sound effect, like for coffee. It also works the way italics do, making a word stand out.
Hiragana does everything else that is not kanji: the small grammar words, the verb endings, and plenty of everyday vocabulary.