diff --git a/headFirst/generics/go.mod b/headFirst/generics/go.mod
new file mode 100644
index 0000000..9d24355
--- /dev/null
+++ b/headFirst/generics/go.mod
@@ -0,0 +1,3 @@
+module main
+
+go 1.25.1
diff --git a/headFirst/generics/main.go b/headFirst/generics/main.go
new file mode 100644
index 0000000..38eb1f0
--- /dev/null
+++ b/headFirst/generics/main.go
@@ -0,0 +1,67 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"log"
+)
+
+type Message struct {
+  Key string `json:"id"`
+  Val string  `json:"user"`
+}
+
+type Receiver struct {
+  First string `json:"id"`
+  Second string `json:"user"`
+}
+
+type Test struct {
+  Name string
+  Age float64
+  Parents []string
+}
+
+
+func main() {
+  m := Message{"lol","kek"}
+  b,err := json.Marshal(m)
+  if err != nil {
+    log.Fatalln("Couldn marshal")
+  }
+  fmt.Println("Binary format on marshalled JSON is ",b)
+  fmt.Println("This is how lookg in string ",string(b))
+
+  var k Receiver
+  err = json.Unmarshal(b,&k)
+  if err != nil {
+    log.Fatalln("Couldn UNmarshal")
+  }
+  // fmt.Println("This is how looks unmarshalled JSON ", k)
+
+  b = []byte(`{"Name":"Wednesday","Age":6,"Parents":["Gomez","Morticia"]}`)
+  var f interface{}
+  _ = json.Unmarshal(b,&f)
+  fmt.Println(f)
+
+  l := f.(map[string]interface{})
+  for k, v := range l {
+    switch vv := v.(type) {
+    case string:
+        fmt.Println(k, "is string", vv)
+    case float64:
+        fmt.Println(k, "is float64", vv)
+    case []interface{}:
+        fmt.Println(k, "is an array:")
+        for i, u := range vv {
+            fmt.Println(i, u)
+        }
+    default:
+        fmt.Println(k, "is of a type I don't know how to handle")
+    }
+  }
+
+  var e Test
+  _ = json.Unmarshal(b,&e)
+  fmt.Println(e)
+}