I was very happy when I first got the Raspberry Pi. Finally, after countless times of burning the system, I felt that it was necessary to write down the steps I went through, so that it could be used as my own memory and avoid backup system. (Maybe if you have more things in your Raspberry Pi in the future, you will still feel that it is safer to back up the system).
First of all, my Raspberry Pi is a 4B, 64-bit machine. I just bought it this year and made a big seeding, which cost 1,000 yuan. I have written about the part of the burning system in another article, so I will skip it here for the time being. First of all, everyone will change the source. After all, if the software is downloaded from a foreign server, it will be very slow. I think most of the domestic mirror systems are Tsinghua University or Alibaba Cloud mirror systems. But what I am burning here is a mirror image source of Nanjing University, so far it is not bad, and it is very easy to use. Here is the link for you:
(17 messages) Raspberry Pi: 64-bit RPI OS (Bullseye) replace domestic source_Ki1381's blog-CSDN blog_Raspberry Pi 64-bit source 
https://blog.csdn.net/ki1381/article/details/ 123857996 Then I downloaded another player SMplayer because of my learning needs. I also forgot which article I read, but there are many on the Internet, just follow the steps.
The third is that I changed the Chinese font of the system and added a Chinese input method. (Below is the link of the Chinese input method)
Raspberry Pi UbuntuMate installs Chinese input method, Google Pinyin-Baidu experience (baidu.com) https://jingyan.baidu.com/article/4f7d5712f06a3d1a20192780.html The fourth is to install java and configure its environment variables. (I installed JAVA to install pycharm. I need java environment variables and so on. I have no choice but to install it.) The link to install JAVA is released below, and the personal test is effective
(17 messages) Raspberry Pi 4B-Installing JAVA (OpenJDK and Oracle Java)_JolyouLu's Blog-CSDN Blog_Raspberry Pi Installing Java https://blog.csdn.net/weixin_44642403/article/details/113792130 Fifth , Installed pycharm, this feels like a lot of people will choose this way. The method is as follows: (The LInux system will not automatically create a desktop shortcut, you need to add it manually, and the link is also placed below)