diff --git a/closures/main.go b/closures/main.go
index 962248e..c093aad 100644
--- a/closures/main.go
+++ b/closures/main.go
@@ -14,7 +14,8 @@ func fib() func() int {
 
 func main() {
 	f := fib()
-	for x := f(); x < 100; x = f() {
+	fmt.Println("This Fibonacci sequense < 10000")
+	for x := f(); x < 10000; x = f() {
 		fmt.Println(x)
 	}
 }
diff --git a/formatIO/b.txt b/formatIO/Testb.txt
similarity index 100%
rename from formatIO/b.txt
rename to formatIO/Testb.txt
diff --git a/formatIO/c.txt b/formatIO/Testc.txt
similarity index 100%
rename from formatIO/c.txt
rename to formatIO/Testc.txt
diff --git a/formatIO/a.txt b/formatIO/testA.txt
similarity index 100%
rename from formatIO/a.txt
rename to formatIO/testA.txt
diff --git a/slices/go.mod b/slices/go.mod
new file mode 100644
index 0000000..e092793
--- /dev/null
+++ b/slices/go.mod
@@ -0,0 +1,3 @@
+module main
+
+go 1.27.0
diff --git a/slices/main.go b/slices/main.go
new file mode 100644
index 0000000..1ca3f1f
--- /dev/null
+++ b/slices/main.go
@@ -0,0 +1,35 @@
+package main
+
+import (
+	"fmt"
+)
+
+func main() {
+	var s []int
+	t := []int{}
+	u := make([]string, 5)
+	v := make([]string, 0, 5)
+
+	fmt.Printf("%d, %d, %T, %5t, %#[3]v\n", len(s), cap(s), s, s == nil)
+	fmt.Printf("%d, %d, %T, %5t, %#[3]v\n", len(t), cap(t), t, t == nil)
+	fmt.Printf("%d, %d, %T, %5t, %#[3]v\n", len(u), cap(u), u, u == nil)
+	fmt.Printf("%d, %d, %T, %5t, %#[3]v\n", len(v), cap(v), v, v == nil)
+
+	s = append(s, 1, 1)
+	fmt.Printf("%d, %d, %T, %5t, %#[3]v\n", len(s), cap(s), s, s == nil)
+	fmt.Println("*****************************")
+	fmt.Println("*****************************")
+	fmt.Println("*****************************")
+	fmt.Println("*****************************")
+	fmt.Println("*****************************")
+
+	a := [...]int{1, 2, 3}
+
+	b := a[:1]
+
+	c := b[:2]
+
+	fmt.Printf("a[%p] = %v\n", &a, a)
+	fmt.Printf("b[%p] = %[1]v\n", b)
+	fmt.Printf("c[%p] = %[1]v\n", c)
+}