what help is needed

Author: Li Yin

how_to_contribute.md

@@ -1,4 +1,10 @@
 # How to contribute to this project?
 The projects requires you to edit on Latex source file located in [Easy-Book](Easy-Book) folder. You can either set up a [local Visual Code environment for latex](https://dev.to/ucscmozilla/how-to-create-and-compile-latex-documents-on-visual-studio-code-3jbk), or you can directly use [Github Codespaces](https://github.com/features/codespaces).
 
-To submite a change, please use Pull Requests.
+To submite a change, please use Pull Requests.
+
+## What help is needed?
+1. Content editing.
+2. Better figure, if you know a better way to draw graph than using GraphViz, let me know.
+3. Complete some chapters, including both theoretical and the problem patterns.
+4. Improve the content.