Since I've found a lot of people are supposed to be confused with migi and hidari that are used to express directions, I will introduce an easy way to memorize them in Kanji.
Adding other two directions, I suggest you to memorize four words to express direction.
Above indicates which directions they each express.
- 上（ue）upper, top, above
- 下（shita）under, below, lower part
- 左（hidari) left
My suggestion is to remember all them connected by a cross like this.
How to remember 上下
Actually 上 means upper but this has a line on the bottom, oppositely 下 means below but it has a line in the top.
Katakana , ト is combined with the bar.
Only in case of 上、the horizontal line needs to be straight instead of be lowered slightly.
How to remember 右左
In fact, these Kanji are erotic. They have common stroke like katakana, ナ on the top. And under ナ , 左 has katakana エ and 右 has katakana ロ.
In Japanese, we call "ero" （エロ）something erotic.
So you can memorize like this...from left to right it is erotic under ナ.lol.