Outside
noun, の adjective
The kanji and the word are exactly the same. That means they share meanings as well.
Since this word is made up of a single kanji, it should use the kun'yomi reading. When learning the kanji, you didn't learn that reading, so here's a mnemonic to help you with this word:
You look outside, it's totally frozen. You throw salt (そと) outside to melt the ice.
外でバーベキューしよう。
Let's barbecue outside.
外に大きなサクラの木があります。
There is a big cherry blossom tree outside.
外と中、どっちがすき?
Which do you prefer, outside or inside?