日 means sun; day and is a JLPT N5 kanji. It has 4 strokes and uses the sun / day radical (日).
Stroke order · 4 strokes
On'yomi (音読み)
ニチ、ジツ
Kun'yomi (訓読み)
ひ、-び、-か
Radical
日 · sun / day
Strokes
4
How to remember 日
The sun seen through a window — the line in the middle is a ray of sunlight. 日本 (Japan) means 'origin of the sun' — without knowing this one kanji, you can't even read the name of Japan.