Protect your Pi from unwanted changes. Overlay File System.

Protect your Pi from unwanted changes. Overlay File System.
sudo raspi-config
Performance options
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Overlay File System keeps Raspberry Pi OS in a fresh state. With Overlay File System enabled, any changes you make are saved to RAM instead of storage, and are lost when you reboot.
This is useful for using Raspberry Pi in a public setting where you want people to be able to
use the operating system without making any permanent changes to it. Such as with a Raspberry Pi set up in a store.
Open Raspberry Pi Configuration and choose the Performance tab. Click Configure next to Overlay File System and enable User Overlay.
The write-protect boot partition enables you to lock down the boot partition for even more security