Ingredients
1.Always use fresh eggs. Eggs separate best when cold.
2.Flour quality varies by brand and by season.. Always sift flour when time permits.  It is helpful.  Sift before measuring!
3.Pay attention to your measurements.  Use proper measuring devices, not soup spoons or regular drinking cups.
4.Butter gives the best flavor and improves the shelf life of a quality cake. But margarine can be used in place of butter in most recipes with a minimal difference in flavor
Mixing
1.Prepare all the necessary ingredients.
2.Before mixing the batter, prepare the pans, turn the oven on, and make sure the rack is in the center.
3.Have all ingredients at room temperature for best results.
4.Cream butter and sugar until light and fluffy or as long as the recipe directs.
5.Always sift flour, baking soda, baking powder and spices to avoid lumps.
6.To speed up the softening of cold butter, slice and let stand for about 10 minutes.
7.Toss nuts, raisins and fruits in the batter last. This will avoid color bleeding.
8.For a lighter cake, separate the eggs. Add the yolks to the butter mixture, whip the egg whites and then fold them into the final batter.
9.Use cocoa powder instead of flour for dusting a greased pan when making a chocolate cake.
10.Scrape sides and bottom of bowl frequently with a rubber spatula during mixing.
11.Spread batter evenly in pans.
12.If using melted chocolate, temper it slightly with some of your batter to prevent lumps.
Baking
1.If your oven temperature is questionable, invest in an oven thermometer. Some ovens might be off by as much as 75°F.
2.Preheat oven to the correct temperature. If you are using glass pans, reduce oven temperatures by 25°F.
3.Shiny coated pans reflect the heat, and are your best choice for cake baking. Grease and lightly flour the pan and cover the bottom with greased waxed paper.
4.Position pans as near to center of oven as possible. Pans should not touch sides of oven or each other.
5.Cake is done when the sides shrink slightly away from the pan and a cake tester or toothpick inserted in center comes out clean.
6.Cool cake in pan 10 - 15 minutes before loosening the edge and turning it out onto a wired rack to cool
Frosting
1.Cool the cake thoroughly before frosting, unless the recipe instructs otherwise.
2.Chill the cake between the filling and the frosting. The cake will be easier to work with.
3.Always do a “crumb layer” before putting your final layer of icing.  Think of it as using a “primer on a wall before you apply the coat of paint”  The crumb layer will keep crumbs out of your icing and will help the final coat of icing to be applied more smoothly.  It will also help “hide the cake,” especially chocolate cakes!
4.Store whipped cream in the refrigerator at all times.

HOW TO BAKE A GREAT CAKE.Here are some tips that will help you perfect your cake
HOW TO ????
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HOW TO MAKE A FROZEN BUTTERCREAM TRANSFER
This is a similar method to the principle of making a color-flow picture, but instead you use frozen buttercream

Get a simple picture  (coloring books work great).  Tape your picture onto a flat, sturdy cardboard.  Cover the board with waxed paper, then cover that with saran wrap (make sure you pull tightly so there are no creases!!

Trace around the outside lines of the picture with whatever color buttercream icing you want, then fill it in with thinned buttercream (just like coloring with icing). HINT:  It is good to make a little larger boarder of the color of the cake icing on the edges of the picture, to help blend better.   Put everything - the picture, board, icing - into the freezer and let if freeze about 30 minutes.  Remove from freezer   Turn the image over and very carefully, pull the saran wrap away from the picture.  Lift the image with your spatula and place on top of iced cake. (NOTE:  IF it is easier for you, you can place the image directly on the cake from the freezer and then carefully pull the saran wrap away from the image).   Allow it to melt onto your iced cake and touch up with soft paint brush if necessary.  NOTE:  Don't do your writing or borders on the cake until after you have placed your picture.  Also remember that the image will be in the reverse direction from the original picture when it is placed on the cake.
HOW TO MAKE PETIT FOURS
Check out this helpful link:
Petit fours