This method is the easiest and most error-free way to install Steam.
Open the terminal and execute the following command:
flatpak install flathub com.valvesoftware.Steam
Steam will take some time to install. Wait until the installation is complete.
When the login prompt appears, the installation is finished. Then log in to your account.
The interface will be in English. Open the settings.
Select Chinese, and it will restart automatically.
After restarting, set it up as shown. The compatibility layer is essential for running Windows-exclusive games. Once familiar, you can switch it yourself.
That's it, enjoy your games. Most official games will work. If not, try switching the compatibility layer.
For detailed gameplay, refer to Bilibili for Steam Deck compatibility layer guides!
中文 
How to create shortcut like in Windows? 
https://bbs.deepin.org/en/post/262345
This method is the easiest and most error-free way to install Steam.
flatpak install flathub com.valvesoftware.Steam
When the login prompt appears, the installation is finished. Then log in to your account.
Select Chinese, and it will restart automatically.
After restarting, set it up as shown. The compatibility layer is essential for running Windows-exclusive games. Once familiar, you can switch it yourself.
That's it, enjoy your games. Most official games will work. If not, try switching the compatibility layer.
For detailed gameplay, refer to Bilibili for Steam Deck compatibility layer guides!