Yes well..you will learn to hate the rootfs (or the lack of space in it..).

The rootfs is very fast memory and is only 256MB (It is not RAM). Here only the most important (with the most need to be accessed) system files and application files should be kept since the space is very limited.

For some strange reason some of the debs are stored in the rootfs (/var/ is in rootfs). Now if rootfs fills up, the device will become unresponsive. You won't receive new messages, media won't be updated and many other problems. So do check that it doesn't fill up.

An app called Conky is a good way to monitor your rootfs usage. You can also use an app called 'storage usage' to easily have more detail of what is eating up space.

P.S. It's good that you are taking the time to read the wiki.