diff --git a/1.Start-Spring-Boot/pom.xml b/01.Start-Spring-Boot/pom.xml
similarity index 100%
rename from 1.Start-Spring-Boot/pom.xml
rename to 01.Start-Spring-Boot/pom.xml
diff --git a/1.Start-Spring-Boot/src/main/java/com/springboot/demo/DemoApplication.java b/01.Start-Spring-Boot/src/main/java/com/springboot/demo/DemoApplication.java
similarity index 100%
rename from 1.Start-Spring-Boot/src/main/java/com/springboot/demo/DemoApplication.java
rename to 01.Start-Spring-Boot/src/main/java/com/springboot/demo/DemoApplication.java
diff --git a/1.Start-Spring-Boot/src/main/resources/application.properties b/01.Start-Spring-Boot/src/main/resources/application.properties
similarity index 100%
rename from 1.Start-Spring-Boot/src/main/resources/application.properties
rename to 01.Start-Spring-Boot/src/main/resources/application.properties
diff --git a/1.Start-Spring-Boot/src/test/java/com/springboot/demo/DemoApplicationTests.java b/01.Start-Spring-Boot/src/test/java/com/springboot/demo/DemoApplicationTests.java
similarity index 100%
rename from 1.Start-Spring-Boot/src/test/java/com/springboot/demo/DemoApplicationTests.java
rename to 01.Start-Spring-Boot/src/test/java/com/springboot/demo/DemoApplicationTests.java