No Probz, if u don't know that.... i could explain it briefly though...

the main concept is that you use 3 main Lights to lit your scene properly...
one is a light comin from an angle , from front , focusing on your key product... that is Called Key Light... u use higher intensity low cone angle that it only covers the Main product/Character....

Second is called Fill Light.... it omits from another angle perhaps and covers larger area to fill the whole/ max environment but u keep less intensity

the Third One is called Kicker... u usually put it behind the Main character... to remove the dark outline which will be at the back of the character....

Hope that helps.....

P.S:: in 3d softwares light does not shatter and reach every part of that scene ...as in reality.... for that purpose what i do is create lots of lights with very low intensity to give the feell that the light is reachin and i don' t have any other source of light emition....