update README

README_en.md

@@ -12,8 +12,6 @@
 - [x] [TCP/UDP transparent proxy](https://gost.run/en/tutorials/redirect/)
 - [x] DNS [resolver](https://gost.run/en/concepts/resolver/) and [proxy](https://gost.run/en/tutorials/dns/)
 - [x] [TUN/TAP device](https://gost.run/en/tutorials/tuntap/)
-- [x] [Unix Domain Socket Redirector](https://gost.run/en/tutorials/unix/)
-- [x] [Serial Port Redirector](https://gost.run/en/tutorials/serial/)
 - [x] [Load balancing](https://gost.run/en/concepts/selector/)
 - [x] [Routing control](https://gost.run/en/concepts/bypass/)
 - [x] [Admission control](https://gost.run/en/concepts/limiter/)
@@ -24,17 +22,32 @@
 - [x] [Web API](https://gost.run/en/tutorials/api/overview/)
 - [ ] Web UI
 
-Wiki: [https://gost.run](https://gost.run/en/)
+## Overview
 
-Telegram: [https://t.me/gogost](https://t.me/gogost)
+![Overview](https://gost.run/images/overview.png)
 
-Google group: [https://groups.google.com/d/forum/go-gost](https://groups.google.com/d/forum/go-gost)
+There are three main ways to use GOST as a tunnel.
 
-Legacy version: [v2.gost.run](https://v2.gost.run/en/)
+### Proxy
+
+As a proxy service to access the network, multiple protocols can be used in combination to form a forwarding chain for traffic forwarding.
+
+![Proxy](https://gost.run/images/proxy.png)
+
+### Port Forwarding
+
+Mapping the port of one service to the port of another service, you can also use a combination of multiple protocols to form a forwarding chain for traffic forwarding.
+
+![Forward](https://gost.run/images/forward.png)
+
+### Reverse Proxy
+
+Use tunnel and intranet penetration to expose local services behind NAT or firewall to public network for access.
+
+![Reverse Proxy](https://gost.run/images/reverse-proxy.png)
 
 ## Installation
 
-
 ### Binary files
 
 [https://github.com/go-gost/gost/releases](https://github.com/go-gost/gost/releases)
@@ -67,3 +80,13 @@ docker run --rm gogost/gost -V
 ### Shadowsocks Android
 
 [xausky/ShadowsocksGostPlugin](https://github.com/xausky/ShadowsocksGostPlugin)
+
+## Support
+
+Wiki: [https://gost.run](https://gost.run/en/)
+
+Telegram: [https://t.me/gogost](https://t.me/gogost)
+
+Google group: [https://groups.google.com/d/forum/go-gost](https://groups.google.com/d/forum/go-gost)
+
+Legacy version: [v2.gost.run](https://v2.gost.run/en/)