火 means fire and is a JLPT N5 kanji. It has 4 strokes and uses the fire radical (火).
Stroke order · 4 strokes
On'yomi (音読み)
カ
Kun'yomi (訓読み)
ひ、-び、ほ-
Radical
火 · fire
Strokes
4
How to remember 火
A person (人) jumping with sparks of fire on both sides, shouting 'hot, hot!' 火曜日 (Tuesday) = 'day of fire'. See 火 in the kitchen and you'll know — the stove, be careful.