こんにちわ!!
I'm an new to Japanese, so forgive me if this question seems silly.
But as I am learning Kanji, I see that there are multiple ways of pronouncing the On'Yomi and Kun'Yomi of a Kanji.
For example: 一. From what I know, in On'Yomi this is pronounced as いち or いつ and the Kun'Yomi is ひと.
The initial question is when would ichi vs. itsu? How about in other words such as 四 よ/ゆ/よん?
どうもありがとうございました!