吹 means to blow and is a JLPT N3 kanji. It has 7 strokes and uses the mouth radical (口).
Stroke order · 7 strokes
On'yomi (音読み)
スイ
Kun'yomi (訓読み)
ふ(く)
Radical
口 · mouth
Strokes
7
How to remember 吹
A mouth (口) opens wide (欠) and releases air — blowing. Playing a flute (吹く) or the wind blowing (吹く) — everything from blowing out a candle to a storm.