diff --git a/README.md b/README.md
index 3b439713f220fdfebf388cd628a89c397c604423..92ee70cf72c9d65243e504adc716f7217e7a4e0a 100644
--- a/README.md
+++ b/README.md
@@ -1 +1 @@
-# hello
\ No newline at end of file
+# CodeChina Explore
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diff --git a/ai/index.yml b/ai/index.yml
deleted file mode 100644
index 2b01a3608543c4abc1584947a4bedede4351e69a..0000000000000000000000000000000000000000
--- a/ai/index.yml
+++ /dev/null
@@ -1,3 +0,0 @@
-name: alibaba
-link: https://bootstarp.com
-description: Bootstrap is a popular front-end framework that streamlines website design. It allows for the creation of easy and responsive web layouts.
\ No newline at end of file
diff --git a/alibaba/index.yml b/alibaba/index.yml
deleted file mode 100644
index 2b01a3608543c4abc1584947a4bedede4351e69a..0000000000000000000000000000000000000000
--- a/alibaba/index.yml
+++ /dev/null
@@ -1,3 +0,0 @@
-name: alibaba
-link: https://bootstarp.com
-description: Bootstrap is a popular front-end framework that streamlines website design. It allows for the creation of easy and responsive web layouts.
\ No newline at end of file
diff --git a/explore/index.yml b/explore/index.yml
deleted file mode 100644
index 2b01a3608543c4abc1584947a4bedede4351e69a..0000000000000000000000000000000000000000
--- a/explore/index.yml
+++ /dev/null
@@ -1,3 +0,0 @@
-name: alibaba
-link: https://bootstarp.com
-description: Bootstrap is a popular front-end framework that streamlines website design. It allows for the creation of easy and responsive web layouts.
\ No newline at end of file
diff --git a/test/index.yml b/test/index.yml
deleted file mode 100644
index e7bfa8f442660168170d782d039a764e10530892..0000000000000000000000000000000000000000
--- a/test/index.yml
+++ /dev/null
@@ -1,3 +0,0 @@
-name: alibaba
-link: https://bootstarp.com
-description: Bootstrap is a popular front-end framework that streamlines website design. It allows for the creation of easy and responsive web layouts.g
\ No newline at end of file
diff --git a/test1/index.yml b/test1/index.yml
deleted file mode 100644
index e7bfa8f442660168170d782d039a764e10530892..0000000000000000000000000000000000000000
--- a/test1/index.yml
+++ /dev/null
@@ -1,3 +0,0 @@
-name: alibaba
-link: https://bootstarp.com
-description: Bootstrap is a popular front-end framework that streamlines website design. It allows for the creation of easy and responsive web layouts.g
\ No newline at end of file
diff --git a/test2/index.yml b/test2/index.yml
deleted file mode 100644
index e7bfa8f442660168170d782d039a764e10530892..0000000000000000000000000000000000000000
--- a/test2/index.yml
+++ /dev/null
@@ -1,3 +0,0 @@
-name: alibaba
-link: https://bootstarp.com
-description: Bootstrap is a popular front-end framework that streamlines website design. It allows for the creation of easy and responsive web layouts.g
\ No newline at end of file
diff --git a/test3/index.yml b/test3/index.yml
deleted file mode 100644
index e7bfa8f442660168170d782d039a764e10530892..0000000000000000000000000000000000000000
--- a/test3/index.yml
+++ /dev/null
@@ -1,3 +0,0 @@
-name: alibaba
-link: https://bootstarp.com
-description: Bootstrap is a popular front-end framework that streamlines website design. It allows for the creation of easy and responsive web layouts.g
\ No newline at end of file
diff --git a/test4/index.yml b/test4/index.yml
deleted file mode 100644
index e7bfa8f442660168170d782d039a764e10530892..0000000000000000000000000000000000000000
--- a/test4/index.yml
+++ /dev/null
@@ -1,3 +0,0 @@
-name: alibaba
-link: https://bootstarp.com
-description: Bootstrap is a popular front-end framework that streamlines website design. It allows for the creation of easy and responsive web layouts.g
\ No newline at end of file
diff --git a/test5/index.yml b/test5/index.yml
deleted file mode 100644
index e7bfa8f442660168170d782d039a764e10530892..0000000000000000000000000000000000000000
--- a/test5/index.yml
+++ /dev/null
@@ -1,3 +0,0 @@
-name: alibaba
-link: https://bootstarp.com
-description: Bootstrap is a popular front-end framework that streamlines website design. It allows for the creation of easy and responsive web layouts.g
\ No newline at end of file
diff --git a/test6/index.yml b/test6/index.yml
deleted file mode 100644
index e7bfa8f442660168170d782d039a764e10530892..0000000000000000000000000000000000000000
--- a/test6/index.yml
+++ /dev/null
@@ -1,3 +0,0 @@
-name: alibaba
-link: https://bootstarp.com
-description: Bootstrap is a popular front-end framework that streamlines website design. It allows for the creation of easy and responsive web layouts.g
\ No newline at end of file
diff --git a/topics/ai/index.yml b/topics/ai/index.yml
new file mode 100644
index 0000000000000000000000000000000000000000..8cabd3e616b73c5ef35feb1d027ad78f6faef04c
--- /dev/null
+++ b/topics/ai/index.yml
@@ -0,0 +1,4 @@
+name: ai
+link: https://en.wikipedia.org/wiki/Artificial_intelligence
+description: Artificial intelligence is the ability of a computer or machine to perform tasks commonly associated with intelligent beings.
+aliases: artificial-intelligence, machine-intelligence
\ No newline at end of file
diff --git a/bootstrap/index.yml b/topics/bootstrap/index.yml
similarity index 100%
rename from bootstrap/index.yml
rename to topics/bootstrap/index.yml
diff --git a/c++/index.yml b/topics/c++/index.yml
similarity index 100%
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rename to topics/c++/index.yml
diff --git a/java/index.yml b/topics/java/index.yml
similarity index 100%
rename from java/index.yml
rename to topics/java/index.yml
diff --git a/php/index.yml b/topics/php/index.yml
similarity index 100%
rename from php/index.yml
rename to topics/php/index.yml
diff --git a/ruby/index.yml b/topics/ruby/index.yml
similarity index 100%
rename from ruby/index.yml
rename to topics/ruby/index.yml