diff --git a/go_book/lissajous/go.mod b/go_book/lissajous/go.mod
new file mode 100644
index 0000000..0170d9f
--- /dev/null
+++ b/go_book/lissajous/go.mod
@@ -0,0 +1,3 @@
+module lissajous
+
+go 1.24.5
diff --git a/go_book/lissajous/kek.gif b/go_book/lissajous/kek.gif
new file mode 100644
index 0000000..18cc232
Binary files /dev/null and b/go_book/lissajous/kek.gif differ
diff --git a/go_book/lissajous/main b/go_book/lissajous/main
new file mode 100755
index 0000000..c801b23
Binary files /dev/null and b/go_book/lissajous/main differ
diff --git a/go_book/lissajous/main.go b/go_book/lissajous/main.go
new file mode 100644
index 0000000..115b997
--- /dev/null
+++ b/go_book/lissajous/main.go
@@ -0,0 +1,53 @@
+package main
+
+import (
+	"image"
+	"image/color"
+	"image/gif"
+	"io"
+	"math"
+	"math/rand"
+	"os"
+	"time"
+)
+
+var palette = []color.Color{color.White,color.Black}
+
+const (
+	whiteIndex = 0
+	blackIndex = 1
+)
+
+func main() {
+	lissajous(os.Stdout)
+}
+
+func lissajous(out io.Writer) { 
+	const (
+		cycles = 5
+		res = 0.001
+		size = 100
+		nframes = 64
+		delay = 8
+	)
+
+	rand.Seed(time.Now().UTC().UnixNano())
+	freq := rand.Float64() * 3.0
+	anim := gif.GIF{LoopCount: nframes}
+	phase := 0.0
+
+	for i := 0; i < nframes; i++ {
+		rect := image.Rect(0,0,2*size+1,2*size+1)
+		img := image.NewPaletted(rect,palette)
+		for t := 0.0; t < cycles*2*math.Pi; t += res {
+			x := math.Sin(t)
+			y := math.Sin(t*freq + phase)
+			img.SetColorIndex(size + int(x*size+0.5), size + int(y*size*0.5),blackIndex)
+
+		}
+		phase += 0.1
+		anim.Delay = append(anim.Delay, delay)
+		anim.Image = append(anim.Image,img)
+	}
+	gif.EncodeAll(out, &anim)
+}
diff --git a/go_book/proj1/go.mod b/go_book/proj1/go.mod
new file mode 100644
index 0000000..529d5da
--- /dev/null
+++ b/go_book/proj1/go.mod
@@ -0,0 +1,3 @@
+module proj1
+
+go 1.24.5
diff --git a/go_book/proj1/main b/go_book/proj1/main
new file mode 100755
index 0000000..c1db4bb
Binary files /dev/null and b/go_book/proj1/main differ
diff --git a/go_book/proj1/main.go b/go_book/proj1/main.go
new file mode 100644
index 0000000..eb2ecdf
--- /dev/null
+++ b/go_book/proj1/main.go
@@ -0,0 +1,14 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	// "strings"
+)
+
+func main() {
+	// var sum string
+	for key,val := range os.Args[:]{
+		fmt.Println("num is",key,"value is", val)
+	}
+}
\ No newline at end of file
diff --git a/Lec10/buf/main.go b/spec_course/Lec10/buf/main.go
similarity index 100%
rename from Lec10/buf/main.go
rename to spec_course/Lec10/buf/main.go
diff --git a/Lec10/go.mod b/spec_course/Lec10/go.mod
similarity index 100%
rename from Lec10/go.mod
rename to spec_course/Lec10/go.mod
diff --git a/Lec10/main.go b/spec_course/Lec10/main.go
similarity index 100%
rename from Lec10/main.go
rename to spec_course/Lec10/main.go
diff --git a/Lec11/go.mod b/spec_course/Lec11/go.mod
similarity index 100%
rename from Lec11/go.mod
rename to spec_course/Lec11/go.mod
diff --git a/Lec11/main.go b/spec_course/Lec11/main.go
similarity index 100%
rename from Lec11/main.go
rename to spec_course/Lec11/main.go
diff --git a/Lec12/go.mod b/spec_course/Lec12/go.mod
similarity index 100%
rename from Lec12/go.mod
rename to spec_course/Lec12/go.mod
diff --git a/Lec12/main.go b/spec_course/Lec12/main.go
similarity index 100%
rename from Lec12/main.go
rename to spec_course/Lec12/main.go
diff --git a/Lec13/go.mod b/spec_course/Lec13/go.mod
similarity index 100%
rename from Lec13/go.mod
rename to spec_course/Lec13/go.mod
diff --git a/Lec13/main.go b/spec_course/Lec13/main.go
similarity index 100%
rename from Lec13/main.go
rename to spec_course/Lec13/main.go
diff --git a/Lec14/go.mod b/spec_course/Lec14/go.mod
similarity index 100%
rename from Lec14/go.mod
rename to spec_course/Lec14/go.mod
diff --git a/Lec14/main.go b/spec_course/Lec14/main.go
similarity index 100%
rename from Lec14/main.go
rename to spec_course/Lec14/main.go
diff --git a/Lec15/go.mod b/spec_course/Lec15/go.mod
similarity index 100%
rename from Lec15/go.mod
rename to spec_course/Lec15/go.mod
diff --git a/Lec15/main.go b/spec_course/Lec15/main.go
similarity index 100%
rename from Lec15/main.go
rename to spec_course/Lec15/main.go
diff --git a/Lec16/go.mod b/spec_course/Lec16/go.mod
similarity index 100%
rename from Lec16/go.mod
rename to spec_course/Lec16/go.mod
diff --git a/Lec16/main.go b/spec_course/Lec16/main.go
similarity index 100%
rename from Lec16/main.go
rename to spec_course/Lec16/main.go
diff --git a/Lec17/go.mod b/spec_course/Lec17/go.mod
similarity index 100%
rename from Lec17/go.mod
rename to spec_course/Lec17/go.mod
diff --git a/Lec17/main.go b/spec_course/Lec17/main.go
similarity index 100%
rename from Lec17/main.go
rename to spec_course/Lec17/main.go
diff --git a/Lec18/figure/go.mod b/spec_course/Lec18/figure/go.mod
similarity index 100%
rename from Lec18/figure/go.mod
rename to spec_course/Lec18/figure/go.mod
diff --git a/Lec18/figure/main.go b/spec_course/Lec18/figure/main.go
similarity index 100%
rename from Lec18/figure/main.go
rename to spec_course/Lec18/figure/main.go
diff --git a/Lec18/go.mod b/spec_course/Lec18/go.mod
similarity index 100%
rename from Lec18/go.mod
rename to spec_course/Lec18/go.mod
diff --git a/Lec18/main.go b/spec_course/Lec18/main.go
similarity index 100%
rename from Lec18/main.go
rename to spec_course/Lec18/main.go
diff --git a/Lec19/go.mod b/spec_course/Lec19/go.mod
similarity index 100%
rename from Lec19/go.mod
rename to spec_course/Lec19/go.mod
diff --git a/Lec19/main.go b/spec_course/Lec19/main.go
similarity index 100%
rename from Lec19/main.go
rename to spec_course/Lec19/main.go
diff --git a/Lec2/main.go b/spec_course/Lec2/main.go
similarity index 100%
rename from Lec2/main.go
rename to spec_course/Lec2/main.go
diff --git a/Lec20/calculator.go b/spec_course/Lec20/calculator.go
similarity index 100%
rename from Lec20/calculator.go
rename to spec_course/Lec20/calculator.go
diff --git a/Lec20/go.mod b/spec_course/Lec20/go.mod
similarity index 100%
rename from Lec20/go.mod
rename to spec_course/Lec20/go.mod
diff --git a/Lec20/main.go b/spec_course/Lec20/main.go
similarity index 62%
rename from Lec20/main.go
rename to spec_course/Lec20/main.go
index e44c82a..823e887 100644
--- a/Lec20/main.go
+++ b/spec_course/Lec20/main.go
@@ -1,15 +1,14 @@
 package main
 
 import (
-	"fmt"
 	"Lec20/rectangle"
+	"fmt"
 )
 
 func main() {
 	// res := add(2,5)
 	// fmt.Println("Addition equals to ",res)
 
-	r := rectangle.New(10,20,"green")
-	fmt.Println("Perimeter: ",r.Perimeter())
+	r := rectangle.New(10, 20, "green")
+	fmt.Println("Perimeter: ", r.Perimeter())
 }
-
diff --git a/Lec20/rectangle/rectangle.go b/spec_course/Lec20/rectangle/rectangle.go
similarity index 100%
rename from Lec20/rectangle/rectangle.go
rename to spec_course/Lec20/rectangle/rectangle.go
diff --git a/Lec3/main.go b/spec_course/Lec3/main.go
similarity index 100%
rename from Lec3/main.go
rename to spec_course/Lec3/main.go
diff --git a/Lec4/go.mod b/spec_course/Lec4/go.mod
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rename to spec_course/Lec4/go.mod
diff --git a/Lec4/main.go b/spec_course/Lec4/main.go
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rename to spec_course/Lec4/main.go
diff --git a/Lec5/go.mod b/spec_course/Lec5/go.mod
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rename to spec_course/Lec5/go.mod
diff --git a/Lec5/main.go b/spec_course/Lec5/main.go
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rename from Lec5/main.go
rename to spec_course/Lec5/main.go
diff --git a/Lec6/go.mod b/spec_course/Lec6/go.mod
similarity index 100%
rename from Lec6/go.mod
rename to spec_course/Lec6/go.mod
diff --git a/Lec6/main.go b/spec_course/Lec6/main.go
similarity index 100%
rename from Lec6/main.go
rename to spec_course/Lec6/main.go
diff --git a/Lec8/main.go b/spec_course/Lec8/main.go
similarity index 100%
rename from Lec8/main.go
rename to spec_course/Lec8/main.go
diff --git a/Lec9/go.mod b/spec_course/Lec9/go.mod
similarity index 100%
rename from Lec9/go.mod
rename to spec_course/Lec9/go.mod
diff --git a/Lec9/main.go b/spec_course/Lec9/main.go
similarity index 100%
rename from Lec9/main.go
rename to spec_course/Lec9/main.go
diff --git a/bin/Lec20 b/spec_course/bin/Lec20
similarity index 100%
rename from bin/Lec20
rename to spec_course/bin/Lec20
diff --git a/bin/main b/spec_course/bin/main
similarity index 100%
rename from bin/main
rename to spec_course/bin/main
diff --git a/count_arr/main.go b/spec_course/count_arr/main.go
similarity index 100%
rename from count_arr/main.go
rename to spec_course/count_arr/main.go
diff --git a/for_perf/endless b/spec_course/for_perf/endless
similarity index 100%
rename from for_perf/endless
rename to spec_course/for_perf/endless
diff --git a/for_perf/go.mod b/spec_course/for_perf/go.mod
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rename to spec_course/for_perf/go.mod
diff --git a/for_perf/main.go b/spec_course/for_perf/main.go
similarity index 100%
rename from for_perf/main.go
rename to spec_course/for_perf/main.go
diff --git a/go.mod b/spec_course/go.mod
similarity index 100%
rename from go.mod
rename to spec_course/go.mod
diff --git a/spec_course/pkg/mod/cache/lock b/spec_course/pkg/mod/cache/lock
new file mode 100644
index 0000000..e69de29