diff --git a/.obsidian/app.json b/.obsidian/app.json
index 06f45c7..cf47506 100644
--- a/.obsidian/app.json
+++ b/.obsidian/app.json
@@ -1,7 +1,7 @@
 {
   "promptDelete": false,
   "newLinkFormat": "relative",
-  "attachmentFolderPath": "./assets/引言",
+  "attachmentFolderPath": "./assets/基础概念",
   "showUnsupportedFiles": false,
   "newFileLocation": "current",
   "useMarkdownLinks": true,
diff --git a/.obsidian/workspace.json b/.obsidian/workspace.json
index 3821b78..a22d736 100644
--- a/.obsidian/workspace.json
+++ b/.obsidian/workspace.json
@@ -13,7 +13,7 @@
             "state": {
               "type": "markdown",
               "state": {
-                "file": "Books/动手学深度学习/引言.md",
+                "file": "Books/动手学深度学习/基础概念.md",
                 "mode": "source",
                 "source": false
               }
@@ -93,7 +93,7 @@
             "state": {
               "type": "backlink",
               "state": {
-                "file": "Books/动手学深度学习/引言.md",
+                "file": "Books/动手学深度学习/基础概念.md",
                 "collapseAll": false,
                 "extraContext": false,
                 "sortOrder": "alphabetical",
@@ -110,7 +110,7 @@
             "state": {
               "type": "outgoing-link",
               "state": {
-                "file": "Books/动手学深度学习/引言.md",
+                "file": "Books/动手学深度学习/基础概念.md",
                 "linksCollapsed": false,
                 "unlinkedCollapsed": true
               }
@@ -133,7 +133,7 @@
             "state": {
               "type": "outline",
               "state": {
-                "file": "Books/动手学深度学习/引言.md"
+                "file": "Books/动手学深度学习/基础概念.md"
               }
             }
           },
@@ -166,9 +166,10 @@
   },
   "active": "82a60b2f86acd8d6",
   "lastOpenFiles": [
+    "Books/动手学深度学习/引言.md",
+    "Books/动手学深度学习/基础概念.md",
     "Books/Java Guide/基础语法.md",
     "Books/Java并发编程/Java并发编程.md",
-    "Books/动手学深度学习/引言.md",
     "Books/从零开始深入学习Spring/IoC.md",
     "Books/Vim实用技巧/一、入门导读.md",
     "Books/从零开始深入学习Spring",
diff --git a/Books/动手学深度学习/基础概念.md b/Books/动手学深度学习/基础概念.md
new file mode 100644
index 0000000..d994dbc
--- /dev/null
+++ b/Books/动手学深度学习/基础概念.md
@@ -0,0 +1,2 @@
+# 损失函数
+用来量化预测值与实际值之间的差距。
\ No newline at end of file
diff --git a/Books/动手学深度学习/引言.md b/Books/动手学深度学习/引言.md
index 2cda6d8..8b13789 100644
--- a/Books/动手学深度学习/引言.md
+++ b/Books/动手学深度学习/引言.md
@@ -1,3 +1 @@
 
-
-# 线性神经网络