“卖”就是把东西给别人，然后收到钱。比如商店里的阿姨卖水果。
“mài” jiù shì bǎ dōngxi gěi biérén, ránhòu shōudào qián. Bǐrú shāngdiàn lǐ de āyí mài shuǐguǒ.
It means to give something to someone in exchange for money. It is often used when talking about shops or people who sell things.
卖是把东西给别人，然后收到钱。比如在商店里卖水果。
mài shì bǎ dōngxi gěi biérén, ránhòu shōudào qián. bǐrú zài shāngdiàn lǐ mài shuǐguǒ.
This word is used when someone gives an item to another person and receives money in return, like selling fruit in a shop.
卖 means to sell, 买 means to buy. They are opposite actions.
售 is a more formal word for selling, often seen in shops.