1

In my understanding :

  • もちろん = of course
  • はい = yes
  • うん = yes

When is each of them more appropriate to use, or is it basically just preference? Are other options more casual than the other options?

5

もちろん is used when you want to say "of course". If you need it to be formal => もちろんです。

はい is formal to say yes and other stuff.

うん is like はい but casual, not to use to people you protocolly respect.

1
  • It is worth to add ええ as well, which is better to be positioned between はい and うん by the politeness. Here's a good material about the usage of these words: nier.go.jp/saka/pdf/N13012049.pdf
    – Rilakkuma
    Mar 18 '15 at 3:20

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