外 means outside and is a JLPT N5 kanji. It has 5 strokes and uses the evening radical (夕).
Stroke order · 5 strokes
On'yomi (音読み)
ガイ、ゲ
Kun'yomi (訓読み)
そと、ほか、はず(す)
Radical
夕 · evening
Strokes
5
How to remember 外
In the evening (夕) someone stands outside telling fortunes (卜 = an ancient divination symbol). Not inside the house, but outside. 外国人 (foreigner) — in Japan, we all fall under this kanji.