Suru vs Yaru
Konnichiwa!
Aside from all the verbs which are formed with 'suru', such as benkyou suru etc, I don't really understand the difference between
Suru and Yaru. For example, if someone asks "shukudai wo shimashita ka", could I answer "mou yarimashita"? Or "mou shimashita"?

Onegaishimasu! (Kana shika yomemasen)

Question

Suru vs Yaru
Konnichiwa! 
Aside from all the verbs which are formed with 'suru', such as benkyou suru etc, I don't really understand the difference between
Suru and Yaru.      For example, if someone asks "shukudai wo shimashita ka", could I answer "mou yarimashita"? Or "mou shimashita"?

Onegaishimasu!  (Kana shika yomemasen)

Answer

Hi!
You can refer to the following page link for general and detailed explanation of the difference between (suru) and (yaru):
https://kawakawalearningstudio.com/all/different-ways-of-using-%E3%82%84%E3%82%8B-yaru-and-%E3%81%99%E3%82%8B-suru/#targetText=In%20general%2C%20in%20situations%20where,more%20useful%20than%20%E3%82%84%E3%82%8B%20yaru.