diff --git a/src/docs/go并发相关.md b/src/docs/go并发相关.md
new file mode 100644
index 0000000..f825695
--- /dev/null
+++ b/src/docs/go并发相关.md
@@ -0,0 +1,8 @@
+# goroutine特性
+    go的执行是非阻塞的, 不会等待
+    go后面的函数返回值会被忽略。
+    调度器不能保证多个goroutine的执行次序
+    没有父子goroutine的概念 所有的goroutine是平等的被调度和执行的
+    Go程序在执行的时候会单独为main函数创建一个goroutine, 遇到其他go关键字时再去创建其他的goroutine
+    Go没有暴露goroutine Id给用户， 所以不能在一个goroutine里面显式的地操作另外一个gorontine,
+    不过runtine包提供了一些函数访问和设置gorontine的相关信息
\ No newline at end of file
diff --git a/src/learn/array.go b/src/learn/array.go
new file mode 100644
index 0000000..bfa8098
--- /dev/null
+++ b/src/learn/array.go
@@ -0,0 +1,20 @@
+package main
+
+import "fmt"
+
+func main() {
+	var a [3]int
+	fmt.Println(a[0])
+	fmt.Println(a[len(a)-1])
+	for i, v := range a {
+		fmt.Println("%d %d \n", i, v)
+
+	}
+	//var tet , bb int = 1, 2
+	var (tet int; bb string)
+	print(tet, bb)
+	months := [...]string{1:"January", 12:"December"}
+	Q2 := months[4:7]
+	fmt.Println("%T %T", months, Q2)
+
+}
diff --git a/src/learn/boiling.go b/src/learn/boiling.go
index 9eb97bc..3885a70 100644
--- a/src/learn/boiling.go
+++ b/src/learn/boiling.go
@@ -1,11 +1,21 @@
 package main
 
-import "fmt"
+import (
+	"fmt"
+	"math"
+)
+
 const boilingF = 212.0
 
-func main(){
+func main() {
 	var F = boilingF
-	var c = (F - 32) * 5 /9
+	var c = (F - 32) * 5 / 9
 	fmt.Printf("boiling point = %g F or %g C\n", F, c)
+	hyhot(1.1, 2.2)
+
+}
 
-}
\ No newline at end of file
+func hyhot(x, y float64) float64 {
+	rturn
+	math.Sqrt(x*x + y*Y)
+}
diff --git a/src/learn/charCount.go b/src/learn/charCount.go
new file mode 100644
index 0000000..61fa89d
--- /dev/null
+++ b/src/learn/charCount.go
@@ -0,0 +1,59 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"io"
+	"os"
+	"unicode"
+	"unicode/utf8"
+)
+
+var g = make(map[string]map[string]map[string]bool)
+var s = []uint{1}
+
+
+func main() {
+	counts := make(map[rune]int)
+	var utflen [utf8.UTFMax + 1]int
+	invalid := 0
+
+	in := bufio.NewReader(os.Stdin)
+	for {
+		r, n, err := in.ReadRune()
+		if err == io.EOF {
+			break
+		}
+
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "charcount:%v\n")
+			os.Exit(1)
+		}
+		if r == unicode.ReplacementChar && n == 1 {
+			invalid++
+			continue
+
+		}
+		counts[r]++
+		utflen[n]++
+	}
+	fmt.Printf("rune\tcount\n")
+	for c, n := range counts {
+		fmt.Printf("%q\t %d\n", c, n)
+
+	}
+	fmt.Print("\nlen\tcount\n")
+	for i, n := range utflen {
+		if i > 0 {
+			fmt.Printf("%d\t%d\n", i, n)
+
+		}
+
+	}
+	if invalid > 0 {
+		fmt.Printf("\n%d invalid UTF-8 characters\n", invalid)
+
+	}
+
+
+}
diff --git a/src/learn/map.go b/src/learn/map.go
new file mode 100644
index 0000000..80448fa
--- /dev/null
+++ b/src/learn/map.go
@@ -0,0 +1,36 @@
+package main
+
+import "fmt"
+
+func test() {
+	ages := map[string]int{
+		"alice":   31,
+		"charlie": 34,
+	}
+	ages["alice"] = 31
+	ages["charlie"] = 34
+
+	// 创建一个空map
+	ages = map[string]int{}
+
+	//使用delete函数从字典中删除一个元素
+	delete(ages, "alice")
+	// 即使键不存在 删除操作也是安全的
+	// map使用给定的键来查找元素
+	// 如果对应的元素不存在 则返回类型的零值
+	//map不是一个变量 因此不能获取他的地址  原因是可能会重新散列 到新的存储位置 这就就可能导致获取的地址无效
+	age, ok := ages["gfgfgfgf"]
+	fmt.Println("%v  %v", age, ok)
+
+}
+
+var m = make(map[string]int)
+
+func k(list []string) string  { return fmt.Sprintf("%q", list) }
+func Add(list []string)       { m[k(list)]++ }
+func Count(list []string) int { return m[k(list)] }
+
+func main() {
+	test()
+
+}
diff --git a/src/learn/slice.go b/src/learn/slice.go
new file mode 100644
index 0000000..d71c2e6
--- /dev/null
+++ b/src/learn/slice.go
@@ -0,0 +1,50 @@
+package main
+
+import "fmt"
+
+func nonempty(strings []string) []string {
+	i := 0
+	for _, s := range strings {
+		if s != "" {
+			strings[i] = s
+			i++
+
+		}
+
+	}
+	return strings[:i]
+
+}
+
+func nonempty2(strings []string) []string {
+
+	out := strings[:0]
+	for _, s := range strings {
+		if s != "" {
+			out = append(out, s)
+
+		}
+
+	}
+	return out
+}
+
+func remove(slice []int, i int) []int {
+	copy(slice[i:], slice[i+1:])
+	return slice[:len(slice)-1]
+}
+
+func remove2(slice []int, i int) []int{
+	slice[i] = slice[len(slice) - 1]
+	return slice[:len(slice) - 1]
+
+}
+
+func main(){
+	s := []int{5, 6, 7, 8, 9}
+
+	fmt.Println(s[:len(s)])
+
+	fmt.Println(remove2(s, 2))
+
+}
\ No newline at end of file
diff --git a/src/learn/struct.go b/src/learn/struct.go
new file mode 100644
index 0000000..6e67195
--- /dev/null
+++ b/src/learn/struct.go
@@ -0,0 +1,42 @@
+package main
+
+import (
+	"fmt"
+	"time"
+)
+
+type Emplyee struct{
+	Id int
+	Name string
+	Address string
+	Dob time.Time
+	Position string
+	Salary int
+	ManagerId int
+}
+
+var dilbert Emplyee
+
+
+func test(){
+	dilbert.Salary -= 5000
+	posPtr := &dilbert.Position
+	*posPtr = "fdfdsfdfd" + *posPtr
+
+	// 点号同样可以用在结构体指针上
+	var emPtr *Emplyee = &dilbert
+	emPtr.Position += "fddddddd"
+
+	// 等价于下面这句
+	(*emPtr).Position += "fddddddd"
+
+	//没有任何成员变量的结构体成为空结构体
+	set := make(map[string]struct{})
+	if _, ok := set[str]; !ok{
+		set[str] = struct{}{}
+
+	}
+
+}
+
+