Note also that you use qu'est-ce que if it appears at the start but quoi at the end.
:: This sentence is a little confusing, do you think this is more clear
Note;
you start a question with "qu'est-ce que"; in order words, "qu'est-ce que" only appears at the start of a question. However, you end a question with "quoi"; in order words, "quoi" only appears at appears at the end of a question.
Example
Qu'est-ce que tu fais?
Notice how the sentence starts with "qu'est-ce que"
Tu fais quoi?
Notice how the sentence ends with "quoi"