doc: update halo2 roadmap.

src/halo2/halo2.md

@@ -1,9 +1,9 @@
 **前置学习 (PLONK & Rust)：**
- - [x] [PLONK Tutorials](https://learn.z2o-k7e.world/plonk-intro-cn/plonk-arithmetization.html) &  [Lookup Gates @secbit](https://github.com/sec-bit/learning-zkp/blob/develop/plonk-intro-cn/plonk-lookup.md)
+ - [x] [PLONK Tutorials](https://learn.z2o-k7e.world/plonk-intro-cn/plonk-arithmetization.html) &  [Lookup Gates @secbit](https://learn.z2o-k7e.world/plonk-intro-cn/plonk-lookup.html)
  - [x] [Rust 圣经](https://course.rs/about-book.html)
 
 **必备学习材料：**
-1. [0xPARC Halo2](https://learn.0xparc.org/materials/halo2/learning-group-1/introduction)  是主要参考的视频课程
+1. [0xPARC Halo2](https://learn.0xparc.org/halo2)  是主要参考的视频课程
 2. [参考代码](https://github.com/zkp-co-learning/halo2-step-by-step/tree/main)   是对课程 Reference 代码必要的优化和版本升级
 3. [参考文档: z2o-k7e-Halo2](https://learn.z2o-k7e.world/halo2/1-Simple-Example.html)   是部分电路图解 & 对代码更细致的阐释(仍更新中...)
 4. 其他必读参考：
@@ -15,6 +15,7 @@
 - [Awesome halo2](https://github.com/adria0/awesome-halo2)
 - [halo2-learning-materials](https://learn.z2o-k7e.world/halo2/halo2.html)
 
+[QA](https://github.com/zkp-co-learning/halo2-step-by-step/discussions)  |  [开营视频回放](https://www.youtube.com/watch?v=0BVaXaRpgww&t=10s)
 
 > !有任何看不懂的 Part 都可以提 [issue](https://github.com/zkp-co-learning/halo2-step-by-step/issues) 或者 [Q&A](https://github.com/zkp-co-learning/halo2-step-by-step/discussions/categories/q-a) ~
 >