i notice alot of the pictures people shoot are at f2 or f4, which causes the background to be slightly blur( they also mentioned its auto)

in order to get a clear sharp overall picture, need to capture at f8 rite??? but how come auto camera tends to go around f2 or f4?? anyone can enliughten me???

but by aiming behind, will the foreground be blurred???

sunbeam, like your pumpkin la? it looks underexpose to me....but i think u shiould be at f2 or something rite??