Could someone explain brushless / Lipos etc

[daz75]

Coming from the old school of brushed / nicads, all this brushless stuff is confusing me

I used to run 10x2 in my Losi XX, i'm guessing there isn't really an equivalent these days, but i'm guessing the lower the number the faster it is, but what i dont get it why some low turn motors are massively cheaper than others, e.g. on this page
http://www.jemodels.com/index.php?ap...rushlessMotors

Also, what's sensorless and sensored all about?

On the Lipo front, i can see different amounts of cells, i assume this is the 1S 2S etc, what's usually used in lets say a Losi 22?

Also, whats the C rating, seems to be about charge and discharge rates, and higher seems more expensive, which i assume means better, but am unsure what it's all about.

Sorry for the probably dumb questions