The 2021 4GB memory mini computer is easy to use. I recommend the following three models, which I think are quite good. I hope they can help you.
1. Shenzhou Mini PC2 D1
The box is still very good, but you can't reinstall the original Windows system by yourself. After installing the system, it will get stuck on the startup interface, and the mouse and keyboard can't be used. There is no USB driver, and there is no PS2 interface, so you can't connect the PS2 keyboard and mouse... Therefore, you can only use the system that comes with the factory in the future. If you want to reinstall it, you can only take it to the after-sales service
If you don't want to spend a lot of money, try Acer Chromebook Spin 713. Although it is not a Windows system, Chrome OS can handle online classes and document editing
If you prefer Linux system, consider Nextcloud Book 3i. Although it has only 4GB of memory, it is well optimized, which is more than enough for daily office work
