乳
This Chinese character means milk.
You can watch how to write this. - (「乳」の書き順（筆順）動画 - 漢字書き順辞典)
There are 2 main ways to read this, "にゅう" or "ちち".
When this is combined with other Chinese characters, this is often read as "にゅう".
For example, "牛乳 (ぎゅうにゅう)" means milk.
"牛 (ぎゅう, うし)" means cow.
Maybe, "牛乳" is often used when you are cooking.
If you are a beginner in Japanese, just learn "牛乳 (ぎゅうにゅう)" for now.
If you can get and drink milk, you won't die for a while even if you are alone in Japan.
By Higashi-Mikawa Kyōjindō Shujin (東三河狂人堂主人)