diff --git a/ceph/ceph.go b/ceph/ceph.go
index d8ef5ea..e2bfa6e 100644
--- a/ceph/ceph.go
+++ b/ceph/ceph.go
@@ -1,29 +1,59 @@
 package main
 
 import (
+	"encoding/json"
 	"fmt"
 	"log"
 
 	"github.com/ceph/go-ceph/rados"
 )
 
+func getPoolSize(cephConn *cephConnection, params string) Poolinfo {
+	monRawAnswer := makeMonQuery(cephConn, map[string]string{"prefix": "osd pool get", "pool": params,
+		"format": "json", "var": "size"})
+	monAnswer := Poolinfo{}
+	if err := json.Unmarshal([]byte(monRawAnswer), &monAnswer); err != nil {
+		log.Fatalf("Can't parse monitor answer. Error: %v", err)
+	}
+	return monAnswer
+
+}
+
+
+
+func makeMonQuery(cephConn *cephConnection, query map[string]string) []byte {
+	monJson, err := json.Marshal(query)
+	if err != nil {
+		log.Fatalf("Can't marshal json mon query. Error: %v", err)
+	}
+
+	monRawAnswer, _, err := cephConn.conn.MonCommand(monJson)
+	if err != nil {
+		log.Fatalf("Failed exec monCommand. Error: %v", err)
+	}
+	return monRawAnswer
+}
+
 
 func main() {
+	var connect cephConnection
+	var err error
+
 	fmt.Println("Creating connection object")
-	conn,err := rados.NewConn()
+	connect.conn,err = rados.NewConn()
 	if err != nil {
 		log.Fatal("Cannot create Connection object\n")
 	}
-	conn.ReadConfigFile("/etc/ceph/ceph.conf")
-	conn.Connect()
-	defer conn.Shutdown()
+	connect.conn.ReadConfigFile("/etc/ceph/ceph.conf")
+	connect.conn.Connect()
+	defer connect.conn.Shutdown()
 
-	poolnames,err := conn.ListPools()
-	if err != nil {
-		log.Fatal("Cannot list pools")
-	}
+	// poolnames,err := connect.conn.ListPools()
+	// if err != nil {
+	// 	log.Fatal("Cannot list pools")
+	// }
 
-	for i,j := range poolnames {
-		fmt.Printf("%d %s\n",i,j)
-	}
+	// for i,j := range poolnames {
+	// 	fmt.Printf("%d %s\n",i,j)
 }
+
diff --git a/ceph/types.go b/ceph/types.go
index 428f2ed..7ff640d 100644
--- a/ceph/types.go
+++ b/ceph/types.go
@@ -1,9 +1,23 @@
-// package main
+package main
+
+import "github.com/ceph/go-ceph/rados"
+
+
+type cephConnection struct {
+	conn  *rados.Conn
+}
+
+type Poolinfo struct {
+	Pool   string `json:"pool,omitempty"`
+	PoolId uint64 `json:"pool_id,omitempty"`
+	Size   uint64 `json:"size,omitempty"`
+}
+
+type Device struct {
+	Class string `json:"class"`
+	ID    int64  `json:"id"`
+	Name  string `json:"name"`
+	Info  OsdMetadata
+}
 
-// const config = "/etc/ceph/ceph.conf"
 
-// type params struct {
-// 	cluster string
-// 	user string
-// 	config string
-// }
diff --git a/headFirst/json/go.mod b/headFirst/json/go.mod
new file mode 100644
index 0000000..2359d15
--- /dev/null
+++ b/headFirst/json/go.mod
@@ -0,0 +1,3 @@
+module main
+
+go 1.24.6
diff --git a/headFirst/json/main.go b/headFirst/json/main.go
new file mode 100644
index 0000000..47f2729
--- /dev/null
+++ b/headFirst/json/main.go
@@ -0,0 +1,25 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"log"
+)
+func main() {
+    input := `{
+        "name": "John Doe",
+        "age": 15,
+        "hobbies": ["climbing", "cycling", "running"]
+    }`
+
+    var target map[string]any
+
+    err := json.Unmarshal([]byte(input), &target)
+    if err != nil {
+        log.Fatalf("Unable to marshal JSON due to %s", err)
+    }
+
+    for k, v := range target {
+        fmt.Printf("k: %s, v: %v\n", k, v)
+    }
+}