In my Nokia N900 i have installed conky and the app is shwoxing me that around 60% of my RAM is already used up and i think thats a lot so i would like to know how can u reduce the RAM usage?

Plus i want to know what is rootfs becuase only 77mb of my rootfs is remaining out of 220?

I must tell you that i dont know a thing about using x terminal, i am a noob in that region.