add frequent links

README.md

@@ -1,5 +1,10 @@
 # Vara Network 入门课程
 
-[课程大纲 & PPT](./slides)
+- [课程大纲 & PPT](./slides)
+- [预备资料](./prerequisites)
 
-[预备资料](./prerequisites)
+## 常用链接
+- [Vara Network 官网](https://vara.network/)
+- [Gear Protocol 白皮书](https://whitepaper.gear.foundation/)
+- [Gear IDEA](https://idea.gear-tech.io/)
+- [ss58 地址转换](https://ss58.org/)

prerequisites/README.md

@@ -1,9 +1,3 @@
-Vara Network 官网
-- https://vara.network/
-
-Gear Protocol 白皮书
-- https://whitepaper.gear.foundation/
-
 熟悉 Gear Wiki 文档结构, 搭建开发环境
 - [Intro to Gear Protocol](https://wiki.gear-tech.io/docs/gear/glossary)
 - [Start building](https://wiki.gear-tech.io/docs/getting-started-in-5-minutes)