upate readme.md

Readme.md

@@ -1,44 +1,35 @@
-# Rust By Practice ([中文 Readme](./zh-CN/Readme.md))
+# Rust By Practice
 
-- Online Reading: [https://practice.rs](https://practice.rs)
+Practice Rust with easy to hard examples, exercises and small projects.
 
-Greetings Rustaceans and welcome here， if you have the following problems: 
+## Read it online
 
-- You have learned basics of Rust, and want to learn more, e.g do some exercises, but found easy ones
-- Practice Rust toolchains, std, ascyn/.await and more
-- Have no idea of what to do next, maybe you tried writing a demo /project, but... not that good or even worse: failed
+- [English](https://practice.rs)
+- [Chinsese](https://zh.practice.rs)
+  
+## Why another?
 
-Maybe you have come to the right place. Here are lots of easy to hard exercises and practices to improve your Rust skills which cover almost every topic in Rust.
+[Rustlings](https://github.com/rust-lang/rustlings) and [Rust By Example](https://github.com/rust-lang/rust-by-example) are absolutely very nice, but Rust By Practice provides a little more:  
 
-In a word, this book will try to help you filling the gap between easy-to-learn and hard-to-use.
+1. We have more exercises of which the difficulty is from easy to hard
+
+2. Covers more topics in Rust, such as **async/await, threads, sync primitives and stand libraries** etc
+   
+3. Learning from small projects, for pratice
+   
+4. Both English and Chinese are supported
 
 ## How to use
-- You can edit exercises online and also run it online
-- **Your only goal is make every exercise comipile with NO ERRORS!**
-- difficulty level: easy: 🌟  medium: 🌟🌟 hard: 🌟🌟🌟  hell: 🌟🌟🌟🌟
+
+- You can edit and run the exercises online
+  
+- **The goal is to make each exercise comipile with NO ERRORS!**
+  
+- Difficulty level: easy: 🌟  medium: 🌟🌟 hard: 🌟🌟🌟  hell: 🌟🌟🌟🌟
 
 
 ## Contributing
-We welcome all kinds of contributors.
 
-Every exercise you have contributed will be annotated with your github name and personal link, it's time to show yourself to the world!
-
-## Learning Rust
-If you are a first-time Rust learner, here are some high quality learning resources :
-- [The Book](https://doc.rust-lang.org/book/index.html) for English  speakers
-- [Rust语言圣经(The Course)](https://course.rs) for Chinese speakers, it covers nearly all the topics in Rust
+All kinds of contributions are welcomed, such as exercise proposing, typo and bug fixing.
 
 
-## difference to rustlings
-[Rustlings](https://github.com/rust-lang/rustlings) only contains small and easy exercises for junior rust devs. There is a big gap between learning Rust and using it in your projects.
-
-Another limit for rustlings is that you have to download rustlings to local machine and compile it first before starting to learn.
-
-## difference to rust by example
-[Rust By Example](https://doc.rust-lang.org/stable/rust-by-example/) is an excellent online book for learning Rust，`exercise.rs` has some small advantages in :
-
-- more topics and exercises，specially for the hard part of Rust，e.g string, lifetime, smart pointers, threads and async/.await etc
-- difficulty from easy to hard，it will minimize the gap between learning and using in projects
-- up-to-date, e.g features which added in Rust 1.59 also have the corresponding exercises in `practice.rs`
-- real practices
-

en/src/SUMMARY.md

@@ -78,4 +78,5 @@
   - [Future](async/future.md)
   - [Pin and Unpin](async/pin-unpin.md)
   - [Stream](async/stream.md)
-  
+  
+- [Stand Library todo](std/intro.md)

en/src/why-exercise.md

@@ -4,7 +4,7 @@
 
 - Online Reading: [https://practice.rs](https://practice.rs)
 
-Greetings Rustaceans and welcome here， if you have the following problems: 
+Greetings and welcome here， if you have the following problems: 
 
 - You have learned basics of Rust, and want to learn more, e.g do some exercises, but found easy ones
 - Practice Rust toolchains, std, ascyn/.await and more