Kanji: 下 shita Down

The shorter bar is BELOW the longer bar.
JLPT N5: 42 / 100 | 3 Strokes

This one also has several more readings, but shita is the most useful for now.

Stroke Order:

Examples:
靴下 kutsu shita - socks [lit. shoes under]
地下 chi ka - underground, basement
年下 toshi shita - junior, younger, young

Example Sentence:
車の下に猫がいます。
kuruma no shita ni neko ga imasu.
There is a cat under the car.