see #12: translation of appendix 1 & 2

book/en-us/appendix2.md

@@ -6,7 +6,31 @@ order: 12
 
 # Appendix 2：Modern C++ Best Practices
 
+In this appendix we will briefly talk about the best practices of modern C++. In general, the author's thoughts on C++'s best practices are mainly absorbed from [Effective Modern C++](https://www.amazon.com/dp/1491903996/ref=cm_sw_em_r_mt_dp_U_-ZgjDb81ERBNP) and [C++ Style Guide](https://google.github.io/styleguide/cppguide.html). In this appendix, we will briefly discuss and use the actual examples to illustrate the methods, and introduce some of **the author's personal**, **non-common**, **non-sensible** best practices, and how to ensure the overall quality of the code.
 
+## Common Tools
+
+TODO
+
+## Coding Style
+
+TODO
+
+## Overall Performance
+
+TODO
+
+## Code Security
+
+TODO
+
+## Maintainability
+
+TODO
+
+## Portability
+
+TODO
 
 [Table of Content](./toc.md) | [Previous Chapter](./appendix1.md)