I'll make this short and sweet.
We've seen carbons that are in chains, true? Now, think about the carbons going in a circle or a ring. Hmm...
Take for example,.
It has eight carbons forming a ring, plus they are all single bonds (and nothing other than carbons or hydrogens) \(\Rightarrow\) octane.
However, it is forming a ring, therefore we name this... a cyclo octane.
Of course, this was a basic example... But it's quite easy to understand.
So yes, you could extend this knowledge and I suppose... make your own structures. Oooh. Comment some below. ^^