1.Num-type
2.Ownership
3.Struct
4.Enum
5.Package-management
6.Vector
7.Error handle
8.Trait 泛型
9.Life time 生命周期
10.Test
11.Minigrep
12.Closure 闭包
13.Smart pointer 智能指针
14.Fearless concurrency 无畏并发