There are many ways to use "use," but here are three of the most common:
1) "use" - similar to 用 in Chinese
ex: I use a pencil to write.
ex: You can use my bag.
2) "used to" - similar to 习惯 in Chinese
ex: I'm used to eating spicy food.
ex: You will get used to the cold weather after a few months.
3) "used to" - did something in the past
ex: I used to eat spicy food when I was in China, but I don't anymore here in Cambodia.
ex: You used to live somewhere cold, but now you have moved to a warm place.
Let me know if have questions about others way to use "use" :)