diff --git a/components/bt/bluedroid/bta/av/bta_av_act.c b/components/bt/bluedroid/bta/av/bta_av_act.c
index a014cf292f..97d240f167 100644
--- a/components/bt/bluedroid/bta/av/bta_av_act.c
+++ b/components/bt/bluedroid/bta/av/bta_av_act.c
@@ -1063,7 +1063,7 @@ void bta_av_stream_chg(tBTA_AV_SCB *p_scb, BOOLEAN started)
 **
 ** Function         bta_av_conn_chg
 **
-** Description      connetion status changed.
+** Description      connection status changed.
 **                  Open an AVRCP acceptor channel, if new conn.
 **
 ** Returns          void
diff --git a/components/bt/bluedroid/bta/hh/bta_hh_le.c b/components/bt/bluedroid/bta/hh/bta_hh_le.c
index 163656fd2d..a7737a467c 100644
--- a/components/bt/bluedroid/bta/hh/bta_hh_le.c
+++ b/components/bt/bluedroid/bta/hh/bta_hh_le.c
@@ -2577,7 +2577,7 @@ void bta_hh_le_get_dscp_act(tBTA_HH_DEV_CB *p_cb)
 **
 ** Function         bta_hh_le_add_dev_bg_conn
 **
-** Description      Remove a LE HID device from back ground connection procedure.
+** Description      Remove a LE HID device from background connection procedure.
 **
 ** Returns          void
 **
@@ -2613,7 +2613,7 @@ static void bta_hh_le_add_dev_bg_conn(tBTA_HH_DEV_CB *p_cb, BOOLEAN check_bond)
 ** Function         bta_hh_le_add_device
 **
 ** Description      Add a LE HID device as a known device, and also add the address
-**                  into back ground connection WL for incoming connection.
+**                  into background connection WL for incoming connection.
 **
 ** Returns          void
 **
@@ -2648,7 +2648,7 @@ UINT8 bta_hh_le_add_device(tBTA_HH_DEV_CB *p_cb, tBTA_HH_MAINT_DEV *p_dev_info)
 **
 ** Function         bta_hh_le_remove_dev_bg_conn
 **
-** Description      Remove a LE HID device from back ground connection procedure.
+** Description      Remove a LE HID device from background connection procedure.
 **
 ** Returns          void
 **
diff --git a/components/bt/bluedroid/bta/include/bta_gattc_int.h b/components/bt/bluedroid/bta/include/bta_gattc_int.h
index 1871878ed6..4996b8feb0 100644
--- a/components/bt/bluedroid/bta/include/bta_gattc_int.h
+++ b/components/bt/bluedroid/bta/include/bta_gattc_int.h
@@ -326,7 +326,7 @@ typedef struct {
     UINT16              reason;
 } tBTA_GATTC_CLCB;
 
-/* back ground connection tracking information */
+/* background connection tracking information */
 #if GATT_MAX_APPS <= 8
 typedef UINT8 tBTA_GATTC_CIF_MASK ;
 #elif GATT_MAX_APPS <= 16
diff --git a/components/bt/bluedroid/stack/gatt/gatt_utils.c b/components/bt/bluedroid/stack/gatt/gatt_utils.c
index 594844c2f9..3030fa410a 100644
--- a/components/bt/bluedroid/stack/gatt/gatt_utils.c
+++ b/components/bt/bluedroid/stack/gatt/gatt_utils.c
@@ -2396,7 +2396,7 @@ tGATT_BG_CONN_DEV *gatt_alloc_bg_dev(BD_ADDR remote_bda)
 **
 ** Function         gatt_add_bg_dev_list
 **
-** Description      add/remove device from the back ground connection device list
+** Description      add/remove device from the background connection device list
 **
 ** Returns          TRUE if device added to the list; FALSE failed
 **
@@ -2536,7 +2536,7 @@ BOOLEAN gatt_find_app_for_bg_dev(BD_ADDR bd_addr, tGATT_IF *p_gatt_if)
 **
 ** Function         gatt_remove_bg_dev_from_list
 **
-** Description      add/remove device from the back ground connection device list or
+** Description      add/remove device from the background connection device list or
 **                  listening to advertising list.
 **
 ** Returns          pointer to the device record
@@ -2599,7 +2599,7 @@ BOOLEAN gatt_remove_bg_dev_from_list(tGATT_REG *p_reg, BD_ADDR bd_addr, BOOLEAN
 **
 ** Function         gatt_deregister_bgdev_list
 **
-** Description      deregister all related back ground connetion device.
+** Description      deregister all related background connection device.
 **
 ** Returns          pointer to the device record
 **
diff --git a/components/bt/bt.c b/components/bt/bt.c
index c53e9c9336..c2da24bd6a 100644
--- a/components/bt/bt.c
+++ b/components/bt/bt.c
@@ -97,7 +97,7 @@ typedef struct {
     intptr_t end;
 } btdm_dram_available_region_t;
 
-/* the mode column will be modifid by release function to indicate the available region */
+/* the mode column will be modified by release function to indicate the available region */
 static btdm_dram_available_region_t btdm_dram_available_region[] = {
     //following is .data 
     {ESP_BT_MODE_BTDM,          0x3ffae6e0, 0x3ffaff10},
@@ -402,7 +402,7 @@ esp_err_t esp_bt_controller_mem_release(esp_bt_mode_t mode)
         return ESP_ERR_INVALID_STATE;
     }
 
-    //already relesed
+    //already released
     if (!(mode & btdm_dram_available_region[0].mode)) {
         return ESP_ERR_INVALID_STATE;
     }
diff --git a/components/bt/include/esp_bt.h b/components/bt/include/esp_bt.h
index dcd531b6d0..a907765d20 100644
--- a/components/bt/include/esp_bt.h
+++ b/components/bt/include/esp_bt.h
@@ -84,7 +84,7 @@ typedef enum {
 
 /**
  * @brief BLE tx power type
- *        ESP_BLE_PWR_TYPE_CONN_HDL0-8: for each connection, and only be set after connetion completed.
+ *        ESP_BLE_PWR_TYPE_CONN_HDL0-8: for each connection, and only be set after connection completed.
  *                                      when disconnect, the correspond TX power is not effected.
  *        ESP_BLE_PWR_TYPE_ADV : for advertising/scan response.
  *        ESP_BLE_PWR_TYPE_SCAN : for scan.
diff --git a/examples/bluetooth/gatt_client/main/gattc_demo.c b/examples/bluetooth/gatt_client/main/gattc_demo.c
index 40ea97ed23..3ade3e9b46 100644
--- a/examples/bluetooth/gatt_client/main/gattc_demo.c
+++ b/examples/bluetooth/gatt_client/main/gattc_demo.c
@@ -223,7 +223,7 @@ static void gattc_profile_event_handler(esp_gattc_cb_event_t event, esp_gatt_if_
                         ESP_LOGE(GATTC_TAG, "esp_ble_gattc_get_descr_by_char_handle error");
                     }
 
-                    /* Erery char have only one descriptor in our 'ESP_GATTS_DEMO' demo, so we used first 'descr_elem_result' */
+                    /* Every char has only one descriptor in our 'ESP_GATTS_DEMO' demo, so we used first 'descr_elem_result' */
                     if (count > 0 && descr_elem_result[0].uuid.len == ESP_UUID_LEN_16 && descr_elem_result[0].uuid.uuid.uuid16 == ESP_GATT_UUID_CHAR_CLIENT_CONFIG){
                         ret_status = esp_ble_gattc_write_char_descr( gattc_if,
                                                                      gl_profile_tab[PROFILE_A_APP_ID].conn_id,
@@ -367,7 +367,7 @@ static void esp_gap_cb(esp_gap_ble_cb_event_t event, esp_ble_gap_cb_param_t *par
         ESP_LOGI(GATTC_TAG, "stop adv successfully");
         break;
     case ESP_GAP_BLE_UPDATE_CONN_PARAMS_EVT:
-         ESP_LOGI(GATTC_TAG, "update connetion params status = %d, min_int = %d, max_int = %d,conn_int = %d,latency = %d, timeout = %d",
+         ESP_LOGI(GATTC_TAG, "update connection params status = %d, min_int = %d, max_int = %d,conn_int = %d,latency = %d, timeout = %d",
                   param->update_conn_params.status,
                   param->update_conn_params.min_int,
                   param->update_conn_params.max_int,
diff --git a/examples/bluetooth/gatt_client/tutorial/Gatt_Client_Example_Walkthrough.md b/examples/bluetooth/gatt_client/tutorial/Gatt_Client_Example_Walkthrough.md
index 45761427c1..0ec4e4e046 100644
--- a/examples/bluetooth/gatt_client/tutorial/Gatt_Client_Example_Walkthrough.md
+++ b/examples/bluetooth/gatt_client/tutorial/Gatt_Client_Example_Walkthrough.md
@@ -650,7 +650,7 @@ This procedure registers notifications to the BLE stack, and triggers an `ESP_GA
                                                                             error");
                     }
 
-                    /* Erery char have only one descriptor in our 'ESP_GATTS_DEMO' demo, so we used first 'descr_elem_result' */
+                    /* Every char has only one descriptor in our 'ESP_GATTS_DEMO' demo, so we used first 'descr_elem_result' */
                     if (count > 0 && descr_elem_result[0].uuid.len == ESP_UUID_LEN_16 && descr_elem_result[0].uuid.uuid.uuid16 == ESP_GATT_UUID_CHAR_CLIENT_CONFIG){
                         ret_status = esp_ble_gattc_write_char_descr( gattc_if, 
 								                        gl_profile_tab[PROFILE_A_APP_ID].conn_id,
diff --git a/examples/bluetooth/gatt_server/main/gatts_demo.c b/examples/bluetooth/gatt_server/main/gatts_demo.c
index a02a3e64e9..ef99c869da 100644
--- a/examples/bluetooth/gatt_server/main/gatts_demo.c
+++ b/examples/bluetooth/gatt_server/main/gatts_demo.c
@@ -228,7 +228,7 @@ static void gap_event_handler(esp_gap_ble_cb_event_t event, esp_ble_gap_cb_param
         }
         break;
     case ESP_GAP_BLE_UPDATE_CONN_PARAMS_EVT:
-         ESP_LOGI(GATTS_TAG, "update connetion params status = %d, min_int = %d, max_int = %d,conn_int = %d,latency = %d, timeout = %d",
+         ESP_LOGI(GATTS_TAG, "update connection params status = %d, min_int = %d, max_int = %d,conn_int = %d,latency = %d, timeout = %d",
                   param->update_conn_params.status,
                   param->update_conn_params.min_int,
                   param->update_conn_params.max_int,
diff --git a/examples/bluetooth/gatt_server/tutorial/Gatt_Server_Example_Walkthrough.md b/examples/bluetooth/gatt_server/tutorial/Gatt_Server_Example_Walkthrough.md
index a717a3bffd..34a44d415c 100644
--- a/examples/bluetooth/gatt_server/tutorial/Gatt_Server_Example_Walkthrough.md
+++ b/examples/bluetooth/gatt_server/tutorial/Gatt_Server_Example_Walkthrough.md
@@ -646,7 +646,7 @@ The `esp_ble_gap_update_conn_params()` function triggers a GAP event `ESP_GAP_BL
 
 ```c
     case ESP_GAP_BLE_UPDATE_CONN_PARAMS_EVT:
-         ESP_LOGI(GATTS_TAG, "update connetion params status = %d, min_int = %d, max_int = %d,  
+         ESP_LOGI(GATTS_TAG, "update connection params status = %d, min_int = %d, max_int = %d,
                   conn_int = %d,latency = %d, timeout = %d",
                   param->update_conn_params.status,
                   param->update_conn_params.min_int,
diff --git a/examples/bluetooth/gatt_server_service_table/main/gatts_table_creat_demo.c b/examples/bluetooth/gatt_server_service_table/main/gatts_table_creat_demo.c
index 525a734562..1b7cd62894 100644
--- a/examples/bluetooth/gatt_server_service_table/main/gatts_table_creat_demo.c
+++ b/examples/bluetooth/gatt_server_service_table/main/gatts_table_creat_demo.c
@@ -262,7 +262,7 @@ static void gap_event_handler(esp_gap_ble_cb_event_t event, esp_ble_gap_cb_param
             }
             break;
         case ESP_GAP_BLE_UPDATE_CONN_PARAMS_EVT:
-            ESP_LOGI(GATTS_TABLE_TAG, "update connetion params status = %d, min_int = %d, max_int = %d,conn_int = %d,latency = %d, timeout = %d",
+            ESP_LOGI(GATTS_TABLE_TAG, "update connection params status = %d, min_int = %d, max_int = %d,conn_int = %d,latency = %d, timeout = %d",
                   param->update_conn_params.status,
                   param->update_conn_params.min_int,
                   param->update_conn_params.max_int,
diff --git a/examples/bluetooth/gattc_multi_connect/main/gattc_multi_connect.c b/examples/bluetooth/gattc_multi_connect/main/gattc_multi_connect.c
index 8cd1bef67b..7cad83f68d 100644
--- a/examples/bluetooth/gattc_multi_connect/main/gattc_multi_connect.c
+++ b/examples/bluetooth/gattc_multi_connect/main/gattc_multi_connect.c
@@ -263,7 +263,7 @@ static void gattc_profile_a_event_handler(esp_gattc_cb_event_t event, esp_gatt_i
                     ESP_LOGE(GATTC_TAG, "esp_ble_gattc_get_descr_by_char_handle error");
                 }
 
-                /* Erery char have only one descriptor in our 'ESP_GATTS_DEMO' demo, so we used first 'descr_elem_result' */
+                /* Every char has only one descriptor in our 'ESP_GATTS_DEMO' demo, so we used first 'descr_elem_result' */
                 if (count > 0 && descr_elem_result_a[0].uuid.len == ESP_UUID_LEN_16 && descr_elem_result_a[0].uuid.uuid.uuid16 == ESP_GATT_UUID_CHAR_CLIENT_CONFIG){
                     ret_status = esp_ble_gattc_write_char_descr( gattc_if,
                                                                  gl_profile_tab[PROFILE_A_APP_ID].conn_id,
@@ -465,7 +465,7 @@ static void gattc_profile_b_event_handler(esp_gattc_cb_event_t event, esp_gatt_i
                     ESP_LOGE(GATTC_TAG, "esp_ble_gattc_get_descr_by_char_handle error");
                 }
 
-                /* Erery char have only one descriptor in our 'ESP_GATTS_DEMO' demo, so we used first 'descr_elem_result' */
+                /* Every char has only one descriptor in our 'ESP_GATTS_DEMO' demo, so we used first 'descr_elem_result' */
                 if (count > 0 && descr_elem_result_b[0].uuid.len == ESP_UUID_LEN_16 && descr_elem_result_b[0].uuid.uuid.uuid16 == ESP_GATT_UUID_CHAR_CLIENT_CONFIG){
                     ret_status = esp_ble_gattc_write_char_descr( gattc_if,
                                                                  gl_profile_tab[PROFILE_B_APP_ID].conn_id,
@@ -663,7 +663,7 @@ static void gattc_profile_c_event_handler(esp_gattc_cb_event_t event, esp_gatt_i
                     ESP_LOGE(GATTC_TAG, "esp_ble_gattc_get_descr_by_char_handle error");
                 }
 
-                /* Erery char have only one descriptor in our 'ESP_GATTS_DEMO' demo, so we used first 'descr_elem_result' */
+                /* Every char has only one descriptor in our 'ESP_GATTS_DEMO' demo, so we used first 'descr_elem_result' */
                 if (count > 0 && descr_elem_result_c[0].uuid.len == ESP_UUID_LEN_16 && descr_elem_result_c[0].uuid.uuid.uuid16 == ESP_GATT_UUID_CHAR_CLIENT_CONFIG){
                     ret_status = esp_ble_gattc_write_char_descr( gattc_if,
                                                                  gl_profile_tab[PROFILE_C_APP_ID].conn_id,
@@ -743,7 +743,7 @@ static void esp_gap_cb(esp_gap_ble_cb_event_t event, esp_ble_gap_cb_param_t *par
     uint8_t adv_name_len = 0;
     switch (event) {
     case ESP_GAP_BLE_UPDATE_CONN_PARAMS_EVT:
-         ESP_LOGI(GATTC_TAG, "update connetion params status = %d, min_int = %d, max_int = %d,conn_int = %d,latency = %d, timeout = %d",
+         ESP_LOGI(GATTC_TAG, "update connection params status = %d, min_int = %d, max_int = %d,conn_int = %d,latency = %d, timeout = %d",
                   param->update_conn_params.status,
                   param->update_conn_params.min_int,
                   param->update_conn_params.max_int,