Havin problems makin cake!! help?

Always pre heat the oven b4 putting the cake batter in. Next: always make sure u have the right temperature in ur oven. Also when u r baking, try not 2 open the oven door so much 2 check up on it, this is a mistake that many do. If u do this, it will slow the baking process & make ur cake bake unevenly! And last, when u think ur cake is done...2 make sure it is baked evenly, take a toothpick & stab the cake right in the middle...if it comes out w a little cake batter on it, its not done give it a few more minutes. If the toothpick comes out clean (no batter) then it is done! =)