Adjusting the Settings on Your Raspberry Pi
The settings that your Raspberry Pi uses are stored in files on the SD card, and many of them are in a file called config.txt that’s in the /boot directory. You can edit this file directly to change your computer’s settings using a simple text editor called Nano that is pre-installed on your Raspberry Pi.
Raspi-config can make changes for you without you having to edit any configuration files, so it’s more convenient than editing config.txt yourself, and there is less risk of error too. If the option you need isn’t covered in the Raspi-config menu, you need to edit the configuration file manually.