前端

html

https://www.runoob.com/html/html-tutorial.html

css

https://www.runoob.com/css/css-tutorial.html

js

https://www.runoob.com/jquery/jquery-tutorial.html

vue

前端稍微有点难的
https://www.runoob.com/vue2/vue-tutorial.html
https://www.runoob.com/vue3/vue3-tutorial.html

后端

java

https://www.runoob.com/java/java-tutorial.html

c++ (我没学)

https://www.runoob.com/cplusplus/cpp-tutorial.html

jdbc

https://www.yiibai.com/jdbc/

springboot (稍微有点难)

https://www.yiibai.com/spring-boot/spring_boot_introduction.html

数据库：

sql

https://www.runoob.com/sql/sql-tutorial.html

mysql

https://www.runoob.com/mysql/mysql-tutorial.html

杂货推荐

https://www.w3school.com.cn/w3c/w3c_intro.asp