Most embedded devices use a read-only root filesystem. This can make them more resilient to unexpected shutdowns that could otherwise cause data corruption. Depending on your application, you might consider your Pi to be an embedded system. This can also help with some issues that can come from SD card unreliability.
Full instructions and explanations are obtained from this link but you can run these commands directly. I modified some of the instructions for personal convenience.
Login with default username and password: (ArchLinux Arm: alarm, alarm, Raspbian: pi, raspberry)
nano /etc/ssh/sshd_config