当 means to hit, to match; correct and is a JLPT N3 kanji. It has 6 strokes and uses the small spark radical (⺌).
Stroke order · 6 strokes
On'yomi (音読み)
トウ
Kun'yomi (訓読み)
あ(たる)、まさ(に)
Radical
⺌ · small spark
Strokes
6
How to remember 当
A spark of light (⺌) landing right in the hand (彐) — the image of a lottery ticket hitting the jackpot. 本当 (true) and お弁当 (lunch box) — both essential words in daily life.