diff --git a/Section12/96.go b/Section12/96.go
new file mode 100644
index 0000000..9261762
--- /dev/null
+++ b/Section12/96.go
@@ -0,0 +1,19 @@
+package main
+
+import (
+	"fmt"
+)
+
+func main() {
+	s1 := "I love Golang!"
+	fmt.Println(s1[2:5])
+
+	s2 := "我爱戈兰"
+	fmt.Println(s2[0:2])
+
+	rs := []rune(s2)
+	fmt.Printf("%T\n", rs)
+
+	fmt.Println(string(rs[0:3]))
+
+}
diff --git a/Section12/98.go b/Section12/98.go
new file mode 100644
index 0000000..23e7833
--- /dev/null
+++ b/Section12/98.go
@@ -0,0 +1,64 @@
+package main
+
+import (
+	"fmt"
+	"strings"
+)
+
+func main() {
+	p := fmt.Println
+	result := strings.Contains("I love Go Programming!", "love")
+	p(result)
+
+	result = strings.ContainsAny("success", "xys")
+	p(result)
+
+	result = strings.ContainsRune("golang", 'g')
+	p(result)
+
+	n := strings.Count("cheese", "e")
+	p(n)
+
+	n = strings.Count("Five", "")
+	p(n)
+
+	p(strings.ToLower("GO PyTHON jaVA"))
+	p(strings.ToUpper("GO PyTHON jaVA"))
+
+	p("go" == "go")
+	p("GO" == "go")
+	p(strings.ToLower("GO") == strings.ToLower("go"))
+	p(strings.EqualFold("GO", "go"))
+
+	myStr := strings.Repeat("ab", 10)
+	p(myStr)
+
+	myStr = strings.Replace("192.168.0.1", ".", ":", -1)
+	p(myStr)
+
+	myStr = strings.ReplaceAll("192.168.0.1", ".", ":")
+	p(myStr)
+
+	s := strings.Split("a,b,c", ",")
+	fmt.Printf("%T\n", s)
+	fmt.Printf("%#v\n", s)
+
+	s = strings.Split("Go for Go!", "")
+	fmt.Printf("%#v\n", s)
+
+	s = []string{"I", "learn", "Golang"}
+	myStr = strings.Join(s, "-")
+	p(myStr)
+
+	myStr = "Orange Green \n Blue Yellow"
+	fields := strings.Fields(myStr)
+	fmt.Printf("%T\n", fields)
+	fmt.Printf("%#v\n", fields)
+
+	s1 := strings.TrimSpace("\t Goodbye Windows, Welcome Linux!\n ")
+	fmt.Printf("%q\n", s1)
+
+	s2 := strings.Trim("...Hello, Gophers!!!?", ".!?")
+	fmt.Printf("%q\n", s2)
+
+}