Why is only yellow writen 色 with behind its color? learning the colors right now. But a lot of times is see that Yellow is written 黄色. But why does only yellow have the 色 (iro) behind it. 色 mean color right? but why is it not 赤色 akairo or 青色 aoiro but only with yellow it is kiiro. I'm confused about that. Is there a explanation?

when do i use これ vs この Can someone explain to me when i use これ/それ/あれ or この/その/あの I don't really understand when i need to use which one. Is there a easy explanation?

手帳 and ノ-ト What is the differens between 手帳 and ノ-ト ??? They are both notebooks right... So what is exactly the differens? and when do you use 手帳 and when ノ-ト ???

differents between くん and ちゃん My textbook says that くん is for a child'sname and ちゃん is for a boy's name. But a boy is also a child, right? So what do you say to a boy that is still a child? And also is there a suffix for a girl child?