understanding exposure

 

think about it like this your collecting rain in a bucket and if you leave it outside a along time then you get a lot of rain and the less time you leave it then you get less rain.

and now picture the more sunlight you let in the picture you get a blur when someone is doing an action and when you leave it less time the better and higher quality it is and now if you want to get an action shot then change you f stop to the biggest number because the hole is going to be small and the smaller the number the bigger the hole.